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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2019029767
pages 551-575

NUMERICAL INVESTIGATION OF MELTING HEAT TRANSFER DURING MICROENCAPSULATED PHASE CHANGE SLURRY FLOW IN MICROCHANNELS

Rabia Shaukat
School of Engineering and Materials Sciences, Queen Mary University of London, London E1 4NS, United Kingdom; Department of Mechanical Engineering, University of Engineering and Technology, Lahore, 54000, Pakistan
Muhammad Sajid Kamran
Department of Mechanical Engineering, University of Engineering and Technology, Lahore, 54000, Pakistan
Shahid Imran
Department of Mechanical Engineering, University of Engineering and Technology, Lahore, 54000, Pakistan
Zahid Anwar
Department of Mechanical Engineering, University of Engineering and Technology, Lahore, 54000, Pakistan
Hassan Ali
Department of Mechanical Engineering, University of Engineering and Technology, Lahore, 54000, Pakistan

ABSTRACT

A numerical investigation of three-dimensional (3D) conjugated heat transfer was performed during laminar flow of microencapsulated phase change material (mPCM) slurry in microchannels. An effective specific heat capacity model was used to take into account for phase change process between solid and liquid. A constant heat flux boundary condition was applied to the top surface of the heat sink. Heat transfer characteristics of mPCM (n-octadecane) slurry of mass concentration ranging from 5% to 20% was compared with that of pure water, including local Nusselt number, local heat-transfer enhancement ratio, and local temperature variations along the channel. The addition of mPCM particles in pure water resulted in enhanced heat transfer performance of the heat sink. The effects of geometrical parameters, including height of the heat sink and spacing of the channels, on thermal resistance, dimensionless temperature of the top surface of the heat sink, and bulk fluid temperature of mPCM slurry were studied. The increase in spacing of the channels (B/D) from 1.2 to 4.0 resulted in 38.5% and 48.0% increases in dimensionless top surface temperature and bulk fluid temperature, respectively. However, the increase in height of the heat sink (H/D) from 2.0 to 4.0 had inappreciable effect. For inlet velocity 1 m/s and mass concentration 20%, the rectangular microchannel heat sink with aspect ratio of 5 showed 67.0% lower thermal resistance but 38.3% lower heat transfer rate per unit pumping power, with respect to the circular microchannel with the same hydraulic diameter.

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