Experimental And Numerical Study About Local Heat Transfer In A Microchannel With A Pin Fin

Keywords

CFD; Flow wake; Local heat transfer coefficient; Local temperature measurements; Microchannel; Numerical simulation; Pin fin; RTD; Turbulence; µPIV

Abstract

Local single-phase flow heat transfer downstream a single pin fin in a microchannel was experimentally and numerically studied. Three distinct flow regimes, depending on the Reynolds number, were characterized, namely: laminar flow with steady wake, laminar flow with unsteady wake, and turbulent flow. Local temperature measurements with high spatial resolution were obtained by incorporating an array of micro resistance temperature detectors (RTDs) (∼55 µm × 55 µm) on the internal microchannel surface. Local surface temperatures were related to the flow structures under different flow regimes. An enhanced local heat transfer coefficient at the trailing edge of the wake region downstream the pillar was observed. It is believed to be a result of vortex shedding and large-scale flow mixing triggered by flow instability at high Reynolds number. The numerical model enabled a full conduction/convection conjugate analysis of the entire system including heat conduction within the solid substrates and heat losses to the surrounding environment. Local heat transfer coefficient downstream the pin fin at each Reynolds number was obtained.

Publication Date

6-1-2018

Publication Title

International Journal of Heat and Mass Transfer

Volume

121

Number of Pages

534-546

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.ijheatmasstransfer.2018.01.034

Socpus ID

85040335152 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85040335152

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