Journal of Computational Methods in Engineering

Journal of Computational Methods in Engineering

Investigation of the effect of changing the type of fluid on the hydrodynamic and thermal characteristics of the flow in a thermal micro-heatsink

Document Type : Original Article

Authors
Ahmad Reza Rahmati
Hamed Noroozi
Department of Mechanical Engineering, University of Kashan, Kashan, Iran
10.47176/jcme.43.2.1020
Abstract
In recent years, many studies have been conducted on the field of microchannels' sinks. The microchannel sink absorbs heat from other equipments and transfers it to the fluid by maximizing the contact area. In the present research, three-dimensional water flow, nanofluid and hybrid nanofluid in heat sink with constant heat flux, have been studied. The simulation process have been done in the commercial software ANSYS fluent. In the simulation process, the constant and uniform heat flux boundary condition has been applied to the bottom of the heat sink's wall. The influence of variables such as the nanoparticles volume fraction, nanoparticles types and Reynolds values on the hydrodynamic performance and heat sink will be investigated. After this stage, two types of nanofluid and one type of hybrid nanofluid in 0.04, 0.02 and 0.01 volume fractions will be considered as well. In this paper, first the pressure drops and heat transfer will be examined, and then the best nanofluid will be defined by considering the coefficient of thermal performance. The simulations show that the heat transfer decreases with increasing the volume fraction in the water-aluminium oxide nanofluid. On the other hand, the heat transfer increases with raising the volume fraction in the water-copper nanofluid. Also in the water-aluminium oxide-copper hybrid nanofluid, the heat transfer rises up in the 0.04 volume fraction in the range of 400 and above values for the Reynolds number.
Keywords
Heat sink
Heat transfer
Nano fluid
Hybrid Nano fluid
Variable properties
Subjects
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