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Article

Jinsheng Wang, Lei Luo, Lei Wang, Bengt Ake Sunden and Songtao Wang

The fluid flow in a rotating channel is obviously different from that in a stationary channel due to the existence of Coriolis force, which, in turn, enhances the heat…

Abstract

Purpose

The fluid flow in a rotating channel is obviously different from that in a stationary channel due to the existence of Coriolis force, which, in turn, enhances the heat transfer on the trailing side and reduces the heat transfer on the leading side. The purpose of this paper is to study various rib configurations combined with channel orientation on heat transfer and frictional loss in a rotating channel.

Design/methodology/approach

In the present study, the k-ω SST model was used as the turbulence model. The fluid flow direction in the channel is radially outward. The angle between the rotation axis and leading side is 45°. The channel aspect ratio (W/H) is 2, the blockage ratio (e/Dn ) is 0.1 and the pitch ratio (P/e) is 10. The Reynolds number is fixed at 10,000 and the rotation number varies from 0 to 0.7. Angled ribs, reversed angled ribs, standard V-shaped ribs and outer-leaning V-shaped ribs, are examined.

Findings

It is found that the reversed angled rib configuration and the outer-leaning V-shaped rib configuration display better heat transfer performance than the V-shaped ribs in rotating condition, which is in contrast to stationary condition. At the leading side, the reversed angled rib and the outer-leaning V-shaped rib show better performance in recovering the heat transfer recession due to the negative effects of the Coriolis force.

Research limitations/implications

In the present study, the fluid is incompressible with constant thermophysical properties and the flow is steady.

Practical implications

The results of this study will be helpful in design of ribbed channels internal cooling for turbine blade.

Originality/value

The results imply that the rib configuration combined with channel orientation significantly impacts the heat transfer performance in a rotating channel. The reversed angled rib and the outer-leaning V-shaped rib show better heat transfer performance than standard V-shaped ribs, especially at high Rotating numbers, which is in contrast to stationary condition. The outer-leaning V-shaped rib has a relatively good heat transfer uniformity along the widthwise direction.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 28 no. 3
Type: Research Article
ISSN: 0961-5539

Keywords

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Article

Qiuzhen Wang, Lan Ma, Liqiang Huang and Lei Wang

The purpose of this paper aims to investigate the effect of a model's eye gaze direction on the information processing behavior of consumers varying based on their gender.

Abstract

Purpose

The purpose of this paper aims to investigate the effect of a model's eye gaze direction on the information processing behavior of consumers varying based on their gender.

Design/methodology/approach

An eye-tracking experiment and a memory test are conducted to test the research hypotheses.

Findings

Compared to an averted gaze, a model with a direct gaze attracts more attention to the model's face among male consumers, leading to deeper processing. However, the findings show that when a model displays a direct gaze rather than an averted gaze, female consumers pay more attention to the brand name, thus leading to deeper processing.

Originality/value

This study contributes to not only the existing eye gaze direction literature by integrating the facilitative effect of direct gaze and considering the moderating role of consumer gender on consumer information processing but also the literature concerning the selectivity hypothesis by providing evidence of gender differences in information processing. Moreover, this study offers practical insights to practitioners regarding how to design appealing webpages to satisfy consumers of different genders.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/OIR-01-2020-0025

Details

Online Information Review, vol. 44 no. 7
Type: Research Article
ISSN: 1468-4527

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Article

Lei Wang and Philip Pong Weng Wong

The purpose of this study is to examine the relationship between religiosity, green purchase attitude (GPA), subjective norm (SN), perceived behavioural control (PBC) and…

Abstract

Purpose

The purpose of this study is to examine the relationship between religiosity, green purchase attitude (GPA), subjective norm (SN), perceived behavioural control (PBC) and green purchase intention (GPI) towards the selection of environmentally friendly hotel. The current study argues that consumers’ incentive variable, namely, religiosity, can influence consumers’ environmentally friendly hotel selection.

Design/methodology/approach

This study had successfully gathered 404 completed questionnaire sets through online surveys. All survey data were subjected to descriptive analysis and analysis of variance using SPSS. Besides that, confirmatory factor analysis and structural equation modelling were performed for the testing of hypotheses.

Findings

The results suggest that religiosity significantly and positively influences GPA, SN, PBC and GPI. Furthermore, GPA and PBC positively and significantly influence GPI. The SN also displays significant positive influence on GPA, while GPA plays a full mediation role between SN and GPI. In addition, statistically significant differences in religiosity, SN and PBC were obtained between religious affiliations of consumers towards environmentally friendly hotel selection.

Originality/value

This study extended the existing knowledge based on the selection of environmentally friendly hotels among religious consumers in the tourism literature. Besides that, these empirical findings would greatly benefit hotel managers and other key stakeholders in the tourism industry.

Details

Tourism Review, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1660-5373

Keywords

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Article

Lei Wang, Philip Pong Weng Wong and Elangkovan Narayanan Alagas

Prior studies mostly investigated the relationship between the cognitive characteristics of individuals and their pro-environmentalism, addressing the need for green hotel…

Abstract

Purpose

Prior studies mostly investigated the relationship between the cognitive characteristics of individuals and their pro-environmentalism, addressing the need for green hotel operators to understand the different green purchase patterns of consumers. The problem is that, although consumers claim they are concerned about environmental issues, their purchasing behaviour does not translate, in practical terms, into actually booking green hotels. In other words, the connection between altruism, environmental knowledge and consumer visiting green hotel is fairly unexplored in the literature. This study aims to analyze the relationships of three types of altruism and two types of environmental knowledge with attitude and intention.

Design/methodology/approach

An integrated theoretical research model was used, based on the value–belief–norm theory of environmentalism. The collection of 248 questionnaires was followed by subsequent empirical testing of the proposed hypotheses, which was performed using SPSS and AMOS.

Findings

The resulting outcomes show a significant positive relationship between green purchase attitude and intention. Further, the biospheric, altruistic and collectivistic values, as well as subjective and objective knowledge were shown to positively influence attitude and intention towards green hotel selection, respectively.

Research limitations/implications

Because of the chosen online sampling method, the research results may lack generalizability. Therefore, researchers are encouraged to test the proposed propositions further.

Originality/value

This paper fulfils an identified need to study how visiting green hotel can be influenced by different types of altruism and environmental knowledge.

Details

International Journal of Culture, Tourism and Hospitality Research, vol. 14 no. 1
Type: Research Article
ISSN: 1750-6182

Keywords

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Article

Lei Luo, Chenglong Wang, Lei Wang, Bengt Ake Sunden and Sangtao Wang

The dimple is adopted into a double wall cooling structure which is widely used in hot gas components to increase the heat transfer effects with relatively low pressure…

Abstract

Purpose

The dimple is adopted into a double wall cooling structure which is widely used in hot gas components to increase the heat transfer effects with relatively low pressure drop penalty. The purpose of this paper is to study the effect of dimple depth and dimple diameter on the target surface heat transfer and the inlet to outlet friction factor.

Design/methodology/approach

The study is carried out by using the numerical simulations. The impingement flow is directly impinging on the dimple and released from the film holes after passing the double wall chamber. The ratio between dimple depth and dimple diameter is varied from 0 to 0.4 and the ratio between dimple diameter and impingement hole diameter is ranging from 0.5 to 3. The Reynolds number is between 10,000 and 70,000. Results of the target surface Nusselt number, friction factor and flow structures are included. For convenience of comparison, the double wall cooling structure without the dimple is considered as the baseline.

Findings

It is found that the dimple can effectively enhance the target surface heat transfer due to thinning of the flow boundary layer and flow reattachment as well as flow recirculation outside the dimple near the dimple rim especially for the large Re number condition. However, the stagnation point heat transfer is reduced. It is also found that for a large dimple depth or large dimple diameter, a salient heat transfer reduction occurs for the toroidal vortex. The thermal performance indicates that the intensity of the heat transfer enhancement depends upon the dimple depth and dimple diameter

Originality/value

This is the first time to adopt a dimple into a double wall cooling structure. It suggests that the target surface heat transfer in a double wall cooling structure can be increased by the use of the dimple. However, the heat transfer characteristic is sensitive for the different dimple diameter and dimple depth which may result in a different flow behavior

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 26 no. 7
Type: Research Article
ISSN: 0961-5539

Keywords

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Article

Lei Wang, Philip Pong Weng Wong and Qi Zhang

Prior tourism literature neglected the negative motivational or attitudinal elements influencing individuals’ travel destination decisions. This study aims to examine the…

Abstract

Purpose

Prior tourism literature neglected the negative motivational or attitudinal elements influencing individuals’ travel destination decisions. This study aims to examine the relationships between animosity, ethnocentrism, attitude, subjective norm (SN), perceived behavioural control (PBC), destination overall image (DOI) and destination visit intention (DVI).

Design/methodology/approach

A quantitative approach was used using a survey methodology involving 402 student responses. The proposed hypotheses were empirically tested with SPSS and AMOS.

Findings

The results demonstrated that animosity and ethnocentrism negatively influenced DOI and DVI. A positive relationship was reported between attitude, DOI and DVI. Additionally, SN and PBC positively influenced DVI. Ethnocentrism, PBC and DOI were also identified with statistically significant differences through gender. Meanwhile, statistically significant differences in attitude, PBC, DOI and DVI were evident between postgraduate students and the counterparts.

Originality/value

This study extends the existing knowledge on how animosity and ethnocentrism influenced DOI and DVI in tourism literature and benefitted Western tourism and key stakeholders in tourism.

目的

以往的旅游文献忽视了影响个人旅游目的地决策的负面动机或态度因素。本研究考察了敌意、民族中心主义、态度、主观规范(SN)、感知行为控制(PBC)、目的地总体形象(DOI)和目的地访问意向(DVI)之间的关系。

设计/方法/方式

本文采用定量方法之中的调查问卷方法, 涉及402名学生的答复。用SPSS和MOS对提议的假设进行了经验测试。

发现

结果表明, 敌意和民族中心主义对多利和DVI产生了负面影响。态度、DOI和DVI之间有积极的关系。此外, SN 和 PBC 对 DVI 产生了积极影响。民族中心主义、PBC 和 DOI 也被确定为通过性别在统计学上显著差异。同时, 研究生与配对物的态度、PBC、DOI、DVI在态度上存在明显差异。

原创性/价值

本研究扩展了关于敌意和民族中心主义如何影响旅游文献中和DVI的现有知识, 并有利于西方旅游业和旅游业主的发展。

Elección de Destino de los Viajeros entre Estudiantes Universitarios en China en medio de COVID-19: Ampliar la Teoría del Comportamiento Planificado

Propósito

La literatura turística anterior descuidó los elementos motivacionales o actitudinales negativos que influyen en las decisiones de destino de viaje de las personas. Este estudio examinó las relaciones entre la animosidad, el etnocentrismo, la actitud, la norma subjetiva (SN), el control de comportamiento percibido (PBC), la imagen general de destino (DOI) y la intención de visita de destino (DVI).

Diseño/metodología/enfoque

Se empleó un enfoque cuantitativo utilizando una metodología de encuesta que implicaba 402 respuestas de los estudiantes. Las hipótesis propuestas se probaron empíricamente con SPSS y AMOS.

Resultados

Los resultados demostraron que la animosidad y el etnocentrismo influyeron negativamente en doi y DVI. Se informó de una relación positiva entre la actitud, doi y DVI. Además, SN y PBC influyeron positivamente en el DVI. El etnocentrismo, el PBC y el DOI también se identificaron con diferencias estadísticamente significativas a través del género. Mientras tanto, las diferencias estadísticamente significativas de actitud, PBC, DOI y DVI eran evidentes entre los estudiantes de posgrado y las contrapartes.

Originalidad/valor

Este estudio amplía los conocimientos existentes sobre cómo la animosidad y el etnocentrismo influyeron en el DOI y la DVI en la literatura turística y beneficiaron al turismo occidental y a las principales partes interesadas en el turismo.

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Article

Zhenhua Wang, Shikui Dong, Zhihong He, Lei Wang, Weihua Yang and Bengt Ake Sunden

H2O, CO2 and CO are three main species in combustion systems which have high volume fractions. In addition, soot has strong absorption in the infrared band. Thus, H2O, CO2

Abstract

Purpose

H2O, CO2 and CO are three main species in combustion systems which have high volume fractions. In addition, soot has strong absorption in the infrared band. Thus, H2O, CO2, CO and soot may take important roles in radiative heat transfer. To provide calculations with high accuracy, all of the participating media should be considered non-gray media. Thus, the purpose of this paper is to study the effect of non-gray participating gases and soot on radiative heat transfer in an inhomogeneous and non-isothermal system.

Design/methodology/approach

To solve the radiative heat transfer, the fluid flow as well as the pressure, temperature and species distributions were first computed by FLUENT. The radiative properties of the participating media are calculated by the Statistical Narrow Band correlated K-distribution (SNBCK), which is based on the database of EM2C. The calculation of soot properties is based on the Mie scattering theory and Rayleigh theory. The radiative heat transfer is calculated by the discrete ordinate method (DOM).

Findings

Using SNBCK to calculate the radiative properties and DOM to calculate the radiative heat transfer, the influence of H2O, CO2, CO and soot on radiation heat flux to the wall in combustion system was studied. The results show that the global contribution of CO to the radiation heat flux on the wall in the kerosene furnace was about 2 per cent, but that it can reach up to 15 per cent in a solid fuel gasifier. The global contribution of soot to the radiation heat flux on the wall was 32 per cent. However, the scattering of soot has a tiny influence on radiation heat flux to the wall.

Originality/value

This is the first time H2O, CO2, CO and the scattering of soot were all considered simultaneously to study the radiation heat flux in combustion systems.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 9
Type: Research Article
ISSN: 0961-5539

Keywords

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Article

Safeer Hussain, Jian Liu, Lei Wang and Bengt Ake Sunden

The purpose of this paper is to enhance the heat transfer and thermal performance in the trailing edge region of the vane with vortex generators (VGs).

Abstract

Purpose

The purpose of this paper is to enhance the heat transfer and thermal performance in the trailing edge region of the vane with vortex generators (VGs).

Design/methodology/approach

This numerical study presents the enhancement of thermal performance in the trailing part of a gas turbine blade. In the trailing part, generally, pin fins are used either in staggered or in-line arrangements to enhance the heat transfer. In this study, based on the idea from heat exchangers, pin fins are combined with VGs. A pair of VGs is embedded in the boundary layer upstream of each pin fin in the first row of the pin fin array having an in-line configuration. The effects of the VG angle relative to the streamwise direction and streamwise distance between the pin fin and VGs are investigated at various Reynolds numbers.

Findings

The results indicated that the endwall heat transfer is enhanced with the addition of VGs and the heat transfer from the surfaces of the pin fins. The level of heat transfer enhancement compared to the case without VGs is more significant at high Reynolds number. The surfaces of the VGs also show a significant amount of heat transfer. Study of the angle of the attack suggested that a high angle of attack is more appropriate for pin fin cooling enhancement whereas an intermediate gap between the VGs and pin fins shows considerable improvement of thermal performance compared to the small and large gaps. The phenomenon of heat transfer augmentation with the VGs is demonstrated by the flow field. It shows that the enhancement of heat transfer is governed by the mixing of the flow as a result of the interaction of vortices generated by the VGs and pin fins.

Originality/value

VGs are used to disturb the thermal boundary layer. It shows that heat transfer is augmented as a result of the interaction of vortices associated with VGs and pin fins.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 29 no. 8
Type: Research Article
ISSN: 0961-5539

Keywords

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Article

Lei Wang and Jorge A. Gonzalez

This study aims to test the presence of an adverse impact against professors belonging to minority groups (African American, Asian American, Hispanic American and foreign…

Abstract

Purpose

This study aims to test the presence of an adverse impact against professors belonging to minority groups (African American, Asian American, Hispanic American and foreign national origin) in official student evaluation of teaching (SET).

Design/methodology/approach

The authors conducted a series of regression analyses to compare SET rating sources and control for course difficulty.

Findings

The regression analysis results showed that White American professors receive higher SET ratings than non-White American and foreign professors, which implies the presence of bias in SET.

Originality/value

To the authors’ knowledge, this is the first study to examine race/ethnicity and national origin bias in SET using official SET results from multiple universities.

Details

International Journal of Organizational Analysis, vol. 28 no. 4
Type: Research Article
ISSN: 1934-8835

Keywords

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Article

Jian Liu, Gongnan Xie, Bengt Ake Sunden, Lei Wang and Martin Andersson

The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties.

Abstract

Purpose

The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties.

Design/methodology/approach

The novel geometries in the present research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. All turbulent fluid flow and heat transfer results are presented using computation fluid dynamics with a validated v2f turbulence closure model. Turbulent flow characteristics and heat transfer performances in square channels with improved ribbed structures are numerically analyzed in this research work.

Findings

Based on the results, it is found that rounded transition cylindrical ribs have a large advantage over the conventional ribs in both enhancing heat transfer and reducing pressure loss penalty. In addition, cylindrical ribs increase the flow impingement at the upstream of the ribs, which will effectively increase the high heat transfer areas. The design of rounded transition cylindrical ribs and grooves will be an effective way to improve heat transfer enhancement and overall thermal performance of internal channels within blade cooling.

Originality/value

The novel geometries in this research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. The combination of cylindrical ribs and grooves to manipulate the turbulent flow.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 7
Type: Research Article
ISSN: 0961-5539

Keywords

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