Search results

Aboriginal students experience disproportionate academic disadvantage at school. It may be that a capacity to effectively deal with academic setback and challenge (academic buoyancy) can reduce the incidence of academic adversity. To the extent that this is the case, academic buoyancy may also be associated with positive educational intentions. This study explores the role of academic buoyancy in Aboriginal students’ post-school educational intentions.

The survey-based study comprises Aboriginal (N = 350) and non-Aboriginal (N = 592) high school students in Australia.

Academic buoyancy yielded larger effect sizes for Aboriginal than non-Aboriginal students’ educational intentions – particularly in senior high school when educational intentions are most likely to translate into post-school educational behaviour.

Post-school education is one pathway providing access to social opportunity. Any thorough consideration of students’ passage into and through post-school education must first consider the bases of students’ academic plans and, by implication, their decision to pursue further study. Identifying factors such as academic buoyancy in this process provides some specific direction for practice and policy aimed at optimizing Aboriginal students’ academic and non-academic development.

Academic buoyancy is a recently proposed construct in the psycho-educational literature and has not been investigated among Aboriginal student populations. Its role in relation to post-school educational intentions is also a novel empirical contribution for both Aboriginal and non-Aboriginal students alike.

This study examined the relationship between early career teachers' (ECTs') perceived professional competence (PC) and teacher buoyancy (TB) and the contribution of such dynamic interaction between ECTs' perceived PC and TB to their thriving in the face of everyday teaching challenges.

The study adopted a concurrent mixed-methods research design. A total of 218 ECTs taking a postgraduate, part-time initial teacher education programme completed two quantitative measures: Professional Competence Questionnaire and Teacher Buoyancy Scale – Extended Version. Structural Equation Modelling (SEM) analysis was conducted to examine the relationship between PC and TB. Qualitative data via semi-structured interviews were collected from 14 survey respondents and were interpreted through a case study approach.

The quantitative findings showed: (1) Competence in classroom teaching predicts the personal and contextual dimensions of teacher buoyancy; and (2) Competence to work in schools predicts the personal dimension of teacher buoyancy. The qualitative findings showed two cases that exemplified how the dynamic interaction between ECTs' perceived PC and the personal and contextual dimensions of TB supported their development of teaching expertise.

The paper provides empirical findings on the relationship between PC and TB. It highlights ECTs' perceived Competence to work in schools as goal alignment and engagement with school policy as a crucial facilitating condition that develops ECTs' capacity to face daily challenges and engenders their thriving in terms of development of teaching expertise.

The purpose of this paper is threefold. Firstly, a new concept, teacher buoyancy, is introduced. Based on the significance to study how teachers bounce back from minor and frequent setbacks (vs. major adversities emphasized in resilience) in their daily work and the research on buoyancy by Martin and Marsh, a dual-component framework to conceptualize this new concept is introduced. Secondly, the development of a new instrument, the Teacher Buoyancy Scale (TBS), to measure it is presented. Thirdly, results of a study using the TBS are reported, which provide insights into how teacher buoyancy can be fostered.

The study employed a quantitative design. A total of 258 teachers taking a part-time initial teacher education (ITE) program completed the TBS. Their responses were analyzed by exploratory factor analysis (EFA). In addition to descriptive statistics and reliability coefficients, Pearson correlation coefficients were calculated to examine the relationship among the factors.

The data analysis indicated five factors, namely, Coping with difficulties, Bouncing back cognitively and emotionally, Working hard and appraising difficulties positively, Caring for one's well-being and Striving for professional growth. These factors can be readily interpreted by the dual-component framework. Correlations among the factors further revealed that enabling factors can be subdivided into more proximal personal strengths relating to direct coping, and more distal personal assets pertaining to personal well-being. It is the latter that correlates most highly with perceived teacher buoyancy.

The most original contribution of this paper is the proposal of the new concept of teacher buoyancy which is teachers' capacity to deal with the everyday challenges that most teachers face in their teaching. The delineation between buoyancy and resilience sharpens the focus of the problem domain that is most relevant to teachers. The development of the TBS provides a useful and reliable instrument to examine teacher buoyancy in future studies.

The purpose of this paper is to design a new instrument toward assessing English as foreign language students’ academic buoyancy and to investigate the association between academic buoyancy and three demographic variables of GPA, gender and educational level using the newly-designed questionnaire.

To do so, a new questionnaire consisting of 27 items was designed which measures four aspects of L2 buoyancy, namely, sustainability, regularity adaptation, positive personal eligibility and positive acceptance of academic life. The scale was then translated into Persian and its validity (computed via confirmatory factor analysis estimates) and reliability (computed via Cronbach’s α) were substantiated.

All the items were found to have accepted factor loading. The results regarding the association between academic buoyancy and demographic variables along with the relevant discussion are presented.

Though over the years, researchers have used a variety of methods and scales to measure buoyancy, all of the instruments have been consisted of few items (usually four) which do not include the many aspects related to student buoyancy as one of the tenets of individual differences in positive psychology. Moreover, the same materials were used for distinctive settings of school and workplace in which the individuals adapt different goal orientations and perspectives. Consequently, the need for designing a comprehensive and specific instrument which includes all the aspects of academic buoyancy focusing on EFL students in higher education is manifested.

The aim of this article is to present the results of a parametric analysis of the entropy generation due to mixed convection in the entry‐developing region between two differentially heated isothermal vertical plates.

The entropy generation was estimated via a numerical solution of the mass, momentum and energy conservation equations governing the flow and heat transfer in the vertical channel between the two parallel plates. The resultant temperature and velocity profiles were used to estimate the entropy generation and other heat transfer parameters over a wide range of the operating parameters. The investigated parameters include the buoyancy parameter (Gr/Re), Eckert number (Ec), Reynolds number (Re), Prandtl number (Pr) and the ratio of the dimensionless temperature of the two plates (θ_T).

The optimum values of the buoyancy parameter (Gr/Re) optimum at which the entropy generation assumes its minimum for the problem under consideration have been obtained numerically and presented over a wide range of the other operating parameters. The effect of the other operating parameters on the entropy generation is presented and discussed as well.

The results of this investigation are limited to the geometry of vertical channel parallel plates under isothermal boundary conditions. However, the concept of minimization of entropy generation via controlling the buoyancy parameter is applicable for any other geometry under any other thermal boundary conditions.

The results presented in this paper can be used for optimum designs of heat transfer equipment based on the principle of entropy generation minimization with particular focus on the optimum design of plate and frame heat exchanger and the optimization of electronic packages and stacked packaging of laminar‐convection‐cooled printed circuits.

This paper introduces the entropy generation minimization via controlling the operating parameters and clearly identifies the optimum buoyancy parameter (Gr/Re) at which entropy generation assumes its minimum under different operating conditions.

Turbulent fluid flow and heat transfer characteristics are analyzed numerically for fluids flowing through a rotating periodical two‐pass square channel. The smooth walls of this two‐pass channel are subject to a constant heat flux. A two‐equation k‐ε turbulence model with modified terms for Coriolis and rotational buoyancy is employed to resolve this elliptic problem. The duct through‐flow rate and rotating speed are fixed constantly; while the wall heat flux into the fluid is varied to examine the rotating buoyancy effect on the heat transfer and fluid flow characteristics. It is disclosed that the changes in local heat transfer due to the rotational buoyancy in the radially outward flow are more significant than those in the radially inward flow. However, the channel averaged heat transfer is altered slightly due to the rotational buoyancy in the both ducts. Whenever the buoyancy effects are sufficiently strong, the flow reversal appears over the leading face of the radially outward‐flow channel, and the radial distance for initiation of flow separation decreases with increasing the buoyancy parameter. A comparison of the present numerical results with the available experimental data by taking buoyancy into consideration is also presented.

This article examines the influence of centrifugal buoyancy on the hydrodynamic and thermal behaviour in fully developed flow through an orthogonally rotating duct of aspect ratio 2:1. A series of computations have been performed at rotation numbers ranging from 0 to 0.2, for constant‐density flows (no buoyancy) and also for different levels of outward and inward buoyancy. The resulting comparisons reveal that for a Reynolds number of 32,500, rotational buoyancy effects become significant at Rayleigh number values greater than 107. In outward flows, buoyancy is found to strengthen the effects of the Coriolis force on the mean motion and, by raising turbulence levels, buoyancy also enhances wall heat transfer along both the pressure and the suction side of the rotating duct. In inward flows, it is found that strong buoyancy can reverse the direction of the Coriolis‐induced secondary motion, which causes a strong rise in wall heat transfer along the suction side and a similarly significant fall in heat transfer along the pressure side. The computed effects on heat transfer are in qualitative agreement with the findings of a number of experimental studies. For both inward and outward flows, at a constant Reynolds number, the modifications of centrifugal buoyancy on the side‐averaged levels of heat transfer correlate reasonably well with the rotational Rayleigh number.

This study aims to investigate the buoyancy-induced heat and mass transfer phenomena in a backward-facing-step (BFS) channel subjected to applied magnetic field using different types of nanofluid.

Conservation equations of mass, momentum, energy and concentration are used through velocity-vorticity form of Navier–Stokes equations and solved using Galerkin’s weighted residual finite element method. The density variation is handled by Boussinesq approximation caused by thermo-solutal buoyancy forces evolved at the channel bottom wall having high heat and concentration. Simulations were carried out for the variation of Hartmann number (0 to 100), buoyancy ratio (−10 to +10), three types of water-based nanofluid i.e. Fe₃O₄, Cu, Al₂O₃ at χ = 6%, Re = 200 and Ri = 0.1.

The mutual interaction of magnetic force, inertial force and nature of thermal-solutal buoyancy forces play a significant role in the heat and mass transport phenomena. Results show that the size of the recirculation zone increases at N = 1 for aiding thermo-solutal buoyancy force, whereas the applied magnetic field dampened the fluid-convection process. With an increase in buoyancy ratio, Al₂O₃ nanoparticle shows a maximum 54% and 67% increase in convective heat and mass transfer, respectively at Ha = 20 followed by Fe₃O₄ and Cu. However, with increase in Ha the Nuavg and Shavg diminish by maximum 62.33% and 74.56%, respectively, for Fe₃O₄ nanoparticles at N = 5 followed by Al₂O₃ and Cu.

This research study numerically examines the sensitivity of Fe₃O₄, Cu and Al₂O₃ nanoparticles in a magnetic field for buoyancy-induced mixed convective heat and mass transfer phenomena in a BFS channel, which was not analyzed earlier.

This paper's aim is to examine flow and heat transfer through vertical channels between parallel plates, which is of prime importance in the design of cooling systems for electronic equipment such as that of finned cold plates in general, plate‐and‐frame heat exchangers, etc.

Numerical and analytical solutions are presented to investigate the heat transfer enhancement and the pressure drop reduction due to buoyancy effects (for buoyancy‐aided flow) for the developing laminar mixed convection in vertical channel between parallel plates in the vicinity of the critical values of the buoyancy parameter (Gr/Re)crt that are obtained analytically. The numerical solutions are presented for a wide range of the buoyancy parameters Gr/Re that cover both of buoyancy‐opposed and buoyancy‐aided flow situations under each of the isothermal boundary conditions under investigation.

Buoyancy parameters greater than the critical values result in building‐up the pressure downstream of the entrance such that the vertical channel might act as a thermal diffuser with possible incipient flow reversal. Locations at which the pressure gradient vanishes and the locations at which the pressure‐buildup starts have been numerically obtained and presented for all the investigated cases.

The study is limited to the laminar flow situation.

The results clearly show that for buoyancy‐aided flow, the increase of the buoyancy parameter enhances the heat transfer and reduces the pressure drop across the vertical channel. These findings are very useful for cooling channel or chimney designs.

The study is original and presents new findings, since none of the previous studies reported the conditions for which pressure buildup might take place due to mixed convection in vertical channels between parallel plates.

The purpose of this study is to use an incompressible smoothed particle hydrodynamics (ISPH) method for simulating buoyancy ratio and magnetic field effects on double diffusive natural convection of a cooper-water nanofluid in a cavity. An open pipe is embedded inside the center of a cavity, and it is occupied by solid particles.

The dimensionless governing equations in Lagrangian form were solved by ISPH method. Two different thermal conditions were considered for the solid particles. The actions of the solid particles were tracked inside a cavity. The effects of Hartman parameter, Rayleigh number, nanoparticles volume fraction and Lewis number on features of heat and mass transfer and flow field were tested.

The results showed that the buoyancy ratio changes the directions of the solid particles diffusion in a cavity. The hot solid particles were raised upwards at aiding mode (N > 0) and downwards at an opposing mode (N < 0). A comparison is made with experimental and numerical simulation results, and it showed a well agreement.

Novel studies for the impacts of buoyancy ratio on the diffusion of solid particles embedded in an open pipe during double-diffusive flow were conducted.