Numerical Study of Passive Heat Transfer Enhancement Methods in Automobile Radiator

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Asadollahi Shahbaboli, Pasha | 2017

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 50313 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Mousavi, Ali
Abstract:
In this study, a three dimensional model of water-ethylene glycol based aluminum oxide nanofluid in the laminar flow of an automobile radiator has been numerically studied. The passive heat transfer enhancement method of twisted tape insertion in the flat tubes of radiator is used. The effects of different parameters on heat transfer and pressure drop have been investigated. Simulation results show that utilizing twisted tapes is an effective way of enhancing heat transfer in an automobile radiator. Despite the pressure drop penalty of using twisted tapes, the thermal performance factor which is a proper criteria for evaluating the practical use of the twisted tapes and considers the effect of heat transfer enhancement and the increase of pressure drop simultaneously is always above unity. The maximum increase of 157% and 201% are observed in the Nusselt number for tubes fitted with quintuple twisted tapes and a twist ratio of 2.87 corresponding to a Reynolds number of 500 and 1000 respectively. The maximum thermal performance factor of 1.59 and 1.76 are also obtained for the same arrangement of twisted tapes at the Reynold number of 500 and 1000 respectively
Keywords:
Nanofluid ; Car Engine Radiator ; Numerical Solution ; Heat Transfer Enhancement ; Twisted Tapes ; Flat Tube

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