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The purpose of the study is to numerically investigate the characteristics of laminar heat transfer and fluid flow in a double tube heat exchanger (DTHE) using water-aluminum oxide (Al₂O₃) nanofluid. The study examines the effects of nanofluid in both counter and parallel flow configurations. Furthermore, an exergy analysis is conducted to assess the impact of nanofluid on exergy destruction.

The single-phase method has been used for Al₂O₃ nanoparticles in water as base fluid in a laminar regime for Reynolds numbers from 400 to 2,000. The effects of nanoparticle volume fractions (0 to 0.1), Nusselt number, Reynolds number, heat transfer coefficient, pressure drop, performance evaluation criteria (PEC) and the impact of counter and parallel flow direction have been studied.

The findings indicate that the incorporation of nanoparticles into the water enhances the heat transfer rate of DTHE. This enhancement is attributed to the improved thermal properties of the working fluid and its impact on the thermal boundary layer. Nusselt number, heat transfer coefficient, and PEC increase by approximately 19.5%, 58% and 1.2, respectively, in comparison to pure water. Conversely, the pressure drop experiences a 5.3 times increase relative to pure water. Exergy analysis reveals that nanofluids exhibit lower exergy destruction compared to pure water. The single-phase method showed better agreement with the experimental results compared to the two-phase method.

Dimensionless correlations were derived and validated with experimental and numerical results for the Nusselt number and PEC for both counter and parallel flow configurations based on the Reynolds number and nanoparticles volume fraction with high accuracy to predict the performance of DTHE without performing time-consuming simulations. Also, an exergy analysis was performed to compare the exergy destruction between nanofluid and pure water.

Given the importance of senior volunteers in an ageing society, this study aims to deepen the understanding of how seniors create well-being by volunteering as service providers in terms of motivations for volunteer participation and value co-creation/co-destruction in service provision.

Focussing on senior volunteers acting as service providers in the tourism sector, this study conducted a programme of qualitative research with 15 senior volunteer tour guides in Japan and the UK through the purposive sampling method. The data were analysed by the Gioia method to identify data structure and create a conceptual model.

Seniors start with a mixture of different motivations, not only symbolic and health ones. However, after a certain period of training, they become more aware of their volunteer role as service providers and may strive to maximise the benefits to their clients. The overall performance of such a role supports their well-being. They may also experience episodes of value co-destruction; such negative experiences may be overcome by building good relationships with their colleagues in the organisation.

The paper identifies organisational support ideas for senior service provider volunteers aimed at overcoming negative experiences and achieving well-being, in terms of training and improved communication between organisation members.

This study contributes to the transformative service research literature by constructing a model to showcase the relationship amongst expectations of volunteering as a service provider, service delivery and well-being creation. This paper also discusses the positive and negative effects of volunteer service delivery on senior volunteers' well-being.

The Mongol invasion caused widespread destruction in many cities; this research studies the destruction course of cities after the Mongol invasion and their reconstruction during the reform period, the change that it brought to the cityscapes of Iranian cities and the difference between the urbanscape of the cities that flourished or were re-established after these destructions with the cities prior to them.

The method of research used is historical interpretation/analysis. The historical texts of pre-Mongolian Persia and texts from the Ilkhanid era are studied, references to the shapes and appearances of Iranian cityscapes are classified, and with the help of contemporary interpretations and existing physical evidence, the urbanscape of these two periods are redrawn and compared to each other.

The selection of scenic meadows to build the city, the presence of many gardens in the urban patterns and the construction of satellite towns around large cities have been the effects of the Mongol tradition of (Yurt) tent-dwelling on Iranian cities during the reforms. The declining population and the massive migration of artists together with the rethinking of the rulers made the existence of dense cities with multi-storey houses less likely. The tradition of pre-designing the city and buildings and designing open and right-angled pathways continued after the Mongol invasion.

The prevailing belief is that during the Mongol era, only the destruction of cities took place and the Mongols did not create any cities and had no influence on urban development. This research aims to challenge that.

The purpose of this work is (1) to supply a framework of actors in sport sponsorship and articulate the service relationships that support these partnerships and (2) to propose research questions in this space that are unaddressed and forward-looking.

Sponsorship is part of a complex network of actors and service relationships found in sport. The sports team, activity, or event is a sport property, often with long-term and dynamic service relationships. The authors consider how a sponsor's relationship with the sport property intersects with organizing bodies, venues, communities and society. The authors identify clusters of actors that interact with and influence other clusters (e.g. governing bodies, media, host community and venue/teams/fans) within an ecosystem, paying special attention to aspects of co-creation and co-destruction and the feedback loops that cause them.

Through this analysis, the authors identify areas of needed research at the intersection of sport sponsorship and service. The model synthesizes the literature from service-dominant logic, sports, sponsorship, systems thinking and co-creation/co-destruction research areas. Using the model and relevant cases, the authors can better understand the complexities of sport service relationships and advance research at the intersection of sport sponsorship and service.

This is the first sport sponsorship service ecosystem model. It is also the first integration of systems thinking with constructs in sport sponsorship and services.

The aim of this research is to discuss the effect of corruption on conventional management of cultural heritage (CH) resources in Nigeria. It identifies the means by which the effect can be curtailed to bring about proper management system in the CH sector and pave the way for economic/sustainable development through cultural tourism in the country.

The research draws from both exploratory and comparative approaches. It took a study of selected locations and museums in the six geopolitical zones of the country, with a review of literatures on cultural heritage management (CHM). It also gives summarized information on the present overall effect of corruption in the CH sector of Nigeria.

The research reveals that there are some levels of mismanagement and destruction of CH resources in the country. This is manifested in acts of museum theft, illicit trafficking, unlawful possession and general mishandling of CH, as well as the deterioration of facilities in the sector. The research gathered that the problem came as a result of wrongful appointment of none heritage experts as heads of heritage-related institutions and agencies. It also results from lack of required attention by the government and other relevant stakeholders (such as community leaders/members, academics and law enforcement agencies, inter alia) toward CH preservation, protection, management and promotion for sustainable development. The research recommends that the government and other CH stakeholders (mentioned above) should make efforts to address the issues discussed, so as to improve the management of CH in the country for sustainable development.

Prior to this research, there has been no publication addressing the effect of corruption on CHM in this context and location. The article makes recommendations that call for action and also set grounds for future discourse.

This study aims to explore families that travel with children, as focuses on vulnerabilities, resource constraints and service exclusion through the lens of transformative service research (TSR). This paper investigates: how the experienced vulnerability of these families is shaped by structural, interpersonal and intrapersonal constraints, and how the constraints influence the family tourist-resource interaction in the air travel service encounter.

In total, 2,855 reviews of the family tourists with children were analyzed with text mining, t-test and multidimensional scaling using the interpretive language R to answer the research questions with analyses on unstructured (e.g. text) and structured (e.g. consumer rating) data.

The findings of the empirical investigation answered how experienced vulnerability is shaped by structural, interpersonal and intrapersonal resource constraints and the types of family tourist-resource interaction in the travel service encounter to understand the resource constraints. The findings of this paper help examine family tourism experiences from a value formation perspective to unfold how stakeholders interact to form value while increasing and decreasing their well-being by the value of co-creation and co-destruction.

This research helps advance the TSR’s service inclusion framework by enabling opportunities, offering choice, relieving suffering and fostering happiness with empirical findings in travel service encounters. These findings are particularly insightful to family tourists with children struggling with unfair access and treatment in aeromobility service encounters, which may help enhance the well-being of individuals and communities.

Following the trait activation theory, this study aims to shed light on the influence of tourists’ personality traits on their value co-destruction (VCD) behavior in “revenge tourism”, considering the moderating effect of perceived risk as the environment factor.

A pilot study (n = 204) was first conducted to check the reliability of the measurement scale and remove inappropriate items. Thereafter, a convenience sampling method was used for data collection in the main survey among people (n = 330) who have at least one traveling experience after COVID-19 tourism restrictions have been terminated. Confirmatory factor analysis and structural equation modeling (SEM) were performed for data analysis to testify the theoretical framework proposed.

Results of SEM analysis show that both resilience and altruism of tourists reduced their VCD behavior. What’s more, perceived risk has been found to moderate the relationship between altruism and VCD behavior. As perceived risk increased, the negative impact of altruism on VCD behavior would be weaken.

VCD have been recently emphasized as a key block to the development of tourism industry. This study examines VCD behavior following the trait activation theory. Results of the study can provide new insights on how to mitigate VCD, which would contribute to the preparation for future tourism crisis management, such as the next pandemic.

根据特质激活理论, 本研究旨在揭示游客人格特质及环境因素对“报复性旅游”中价值共毁行为的影响。

本研究先通过预调研检验测量量表的可靠性, 并删除不适当的项目。正式调研采用便利抽样法, 研究对象为COVID-19旅游限制终止后有过至少有一次旅行经历的人群, 共收到330份有效问卷。本研究采用验证性因子分析及结构方程模型进行数据分析, 对提出的理论模型进行验证。

SEM分析结果显示, 游客的弹性和利他主义都降低了他们的价值共毁行为。此外, 感知风险调节利他主义与价值共毁行为之间的关系。随着感知风险的增加, 利他主义对价值共毁行为的负面影响会减弱。

价值共毁是旅游业发展的一个重要障碍。本研究以特质激活理论为基础, 研究游客价值共毁行为。本研究可以为如何减少价值共毁行为提供有价值的建议, 有助于为未来的旅游危机管理做好准备, 如下一次大流行病。

Siguiendo la Teoría de la Activación del Rasgo, el estudio tiene como objetivo arrojar luz sobre la influencia de los rasgos de la personalidad de los turistas en su comportamiento de codestrucción de valor en el “turismo de venganza”, considerando el efecto moderador del riesgo percibido como el factor de entorno.

En primer lugar, se realizó un estudio piloto (n = 204) para comprobar la fiabilidad de la escala de medición y eliminar los ítems inadecuados. Posteriormente, se utilizó un método de muestreo de conveniencia para la recogida de datos de la encuesta principal entre personas (n = 330) que tuvieran, al menos, una experiencia de viaje tras la finalización de las restricciones turísticas derivadas del COVID-19. Para la evaluación del marco teórico propuesto se utilizó el análisis factorial confirmatorio y los modelos de ecuaciones estructurales.

Los resultados del análisis de ecuaciones estructurales muestran que tanto la resiliencia como el altruismo de los turistas redujeron su comportamiento de codestrucción de valor. Además, se ha comprobado que el riesgo percibido modera la relación entre el altruismo y el comportamiento de codestrucción de valor. A medida que aumenta el riesgo percibido se debilita el impacto negativo del altruismo en el comportamiento de codestrucción de valor.

Recientemente se ha destacado que la codestrucción de valor es un obstáculo clave para el desarrollo de la industria turística. Este estudio examina el comportamiento de codestrucción de valor siguiendo la Teoría de la Activación del Rasgo. Los resultados del estudio pueden proporcionar nuevos conocimientos sobre cómo mitigar la codestrucción de valor, lo que contribuiría a la preparación de la gestión de futuras crisis turísticas, como la próxima pandemia.

This theoretical study aims to clarify the (a priori) ambiguous effect of homeownership on unemployment. In general, in fact, homeownership discourages job mobility, but homeowners are less likely to be unemployed than tenants, since homeownership would seem to be positively related to human capital.

This study develops a modified version of the benchmark theoretic model of the labour market – the well-known “equilibrium unemployment theory” – where homeownership affects both the “Beveridge Curve” (BC, by means of job immobility) and the “Job Creation Condition” (JCC, by means of human capital).

The general result is that an increase in homeownership increases unemployment. Therefore, policymakers could encourage job mobility, before facilitating homeownership. This policy implication, however, may not apply in the case of high inflation and/or low nominal interest rate, and when the job destruction rate depends on the homeownership rate.

The model studies the steady-state equilibrium of the labour market, so the policy implications only relate to the long-run. The model, therefore, does not consider the short-run effects of homeownership on unemployment (which may differ from the long-term results).

The model suggests a public policy characterised by large investment in rail lines and subsidised commuter fares. By promoting a more efficient allocation of workers across regions (and, thus, job mobility), indeed, this policy can be a good way to increase employment, without harming homeownership.

The practical implication of this model is also a social implication, since it relates to homeownership and housing tenure.

To the best of author’s knowledge, this is the first model that introduces the key role of homeownership in the so-called “Equilibrium unemployment theory”. Precisely, the model uses a modified version of both the BC (which includes the negative effect of homeownership on the overall job search intensity of unemployed workers) and the JCC (which includes the positive effect of homeownership on both the business start-up and the human capital of workers). By comparing these two opposite effects, this theoretical work makes clearer the net effect of homeownership on unemployment.

Infrastructure forms a basis for the operations and sustainability of the modern society. This paper aims to recognize value creation from the infrastructure procurement ecosystem perspective to achieve those goals. The pursuit of enhancing value creation involves an examination of infrastructure procurement challenges, boundaries as well as boundary spanners that facilitate effective knowledge transfer and interaction.

The qualitative study is based on content analysis of 25 thematic interviews. Data was transcribed and coded via Atlas.ti software.

Infrastructure procurement value creation challenges appear complex and related to boundaries that hamper collaboration, coordination and knowledge sharing. Our results show that these boundaries locate within and between different levels of procurement ecosystem. Therefore, value creation in infrastructure procurement requires boundary spanners for leveraging knowledge sharing and interaction. Artifacts, discussion, processes and brokers as identified boundary spanners are strongly nested and interrelated in the industry. Special attention should be given to supporting individuals to act as brokers, since they play the key roles in trust building, culture steering and usage of other boundary spanners.

Promoting value creation in infrastructure procurement helps to achieve socio-economic development goals.

This study offers a unique perspective on value creation in the context of infrastructure by adopting an ecosystem lens and examining boundary crossing mechanisms. The results support future development of collaboration and knowledge sharing practices fostering procurement productivity.

Social factors, such as fellow spectators in a stadium or other fans sharing their experiences on online platforms, play a dominant role in spectator sport consumption. This conceptual article sets out to achieve three objectives: classify customer-to-customer (C2C) interactions in the sport fan context, develop a framework that links the classification of interactions to relevant outcomes and identify areas for related future research.

The authors integrate conceptual and empirical contributions on C2C interactions in the service, marketing and sport management literature.

The article proposes classifying C2C interactions into synchronous multi- and uni-directional interactions as well as asynchronous multi- and uni-directional interactions. The C2C interaction framework (C2CIF) proposes that such C2C interactions have hedonic, social, symbolic and utilitarian value outcomes. It further suggests that physiological, psychological and social processes underlie the co-creation or co-destruction of value and identifies contingencies at both the fan and the brand level.

Based on the C2CIF, we identify relevant topics for future research, in particular relating to technology-supported and virtual interactions among fans, fan-to-fan interactions across different countries and cultural backgrounds and fan-to-fan interactions as a way to reduce societal concerns.