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RISS 인기검색어
- 검색키워드
- 저자 : Dipankar Bhanja (검색결과 4 건)
- 무료
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Tuhin Deshamukhya,Dipankar Bhanja,Sujit Nath,Saheera Azmi Hazarika 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.9
The current study deals with the optimization of significant variables which govern the heat transfer from a porous fin in convective medium using particle swarm optimization (PSO). The temperature distribution of the fin is obtained analytically by a perturbation technique called homotopy perturbation method (HPM). To validate the temperature distribution obtained by HPM, finite difference method is employed. Next a significance analysis has been carried out to identify important variables that play a vital role in transferring heat from the porous fin. The set of variables thus obtained was then optimized by PSO to enhance the heat transfer rate. Reflective boundary condition is incorporated in the PSO to prevent particles from wandering in the infeasible region. The convergence plots of the variables show the effectiveness of PSO in solving non linear problems of this magnitude which are often encountered in the analysis of heat transfer through porous fins.
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Mohd Zeeshan,Sujit Nath,Dipankar Bhanja 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9
The effect of winglet height on the thermal-hydraulic performance of finned tube heat exchanger (FTHE) is investigated numerically. The rectangular winglet pairs (RWPs) having 5° attack angle are placed in common flow up (CFU) manner adjacent to the tubes for analysis. The air-side performance evaluation has been done based on the area goodness factor (j/f). The working fluid (air) is considered as incompressible fluid. Additionally, MOORA (multi objective optimization on the basis of ratio analysis) method is employed to get the best performance order of various configurations by taking Nusselt number (Nu) and area goodness factor (j/f) as beneficial attributes and friction factor (f) as a non-beneficial attribute having equal significances. The present study reveals that the rectangular vortex generators having 60 % of the channel height provides the better thermal hydraulic performance compared to the other considered cases.
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Saheera Azmi Hazarika,Dipankar Bhanja,Sujit Nath,Balaram Kundu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.5
An analytical model based on homotopy perturbation method is developed to analyze the thermal performance and optimum geometric dimensions of a T-shaped fin under fully wet condition by adopting a linear model between the humidity ratio of saturated air adjacent to the fin surface and the corresponding fin surface temperature. The optimization analysis is done by using the Lagrange multiplier technique and by maximizing the heat transfer rate for a constraint fin volume. The analysis is done in a comparative way between linear variation and cubic variation of the humidity ratio with the corresponding saturation temperature. Finally, it can be concluded that the consideration of the linear model for analysis of wet T-shaped fin does not introduce any significant deviation in results.
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Pabitra Kumar Mandal,Sayantan Sengupta,Subhas Chandra Rana,Dipankar Bhanja 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11
The present problem is devoted to establish the effect of orientation on thermohydraulic performance of a horizontal heat sink with vertical pin-fin-array under forced convective environment. The fins are embedded on the base-plate of the heat sink in inline and staggered manner. When air passes over the fin-arrays it convects the heat conducted from the solid base-plate to the fins’ surface. Both the experimental and numerical studies have been performed under the same geometric configurations of the test plate and an acceptable agreement in results is obtained. To examine the influence of the orientation angle ( β ) on system performance, the heat sink is rotated anticlockwise in a regular interval from 0° to 360° about a vertical axis passing through the centre of the sink. The study has been performed over a large number of incoming Reynolds numbers (Re = 8500 to 38500) to investigate the possibility to achieve an optimal angle of orientation when Nusselt number (Nu) is maximum. Test results show that thermal dissipation attains maximum value at β = 40° for the inline array and that for β = 120° in case of staggered array. For low Reynolds number values (Re = 8500), the system performance is found better at an angle 35° and 120° for inline and staggered arrangement respectively. However, with Re = 38500, the maximum system performance is achieved at an angle 10° and 240° for inline and staggered arrangement respectively.
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