Heat Transfer Coefficient Measurements In The Thermal Boundary Layer Of Microchannel Heat Sinks

Keywords

anisotropic heating; liquid cooling; nanoscale heat transport; overall thermal conductance; TDTR

Abstract

This study describes the use of optical pump-probe diagnostics to characterize the heat transfer coefficient (HTC) in a developing thermal boundary layer in a microchannel. We use a differential form of the anisotropic time-domain thermoreflectance (TDTR) technique to measure the HTC as a function of fluid flow rate (or Reynolds number, Re). The testing environment/geometry consists of single-phase, degassed water flowing in a rectangular microchannel (hydraulic diameter Dh â‰. 480 μm) with local spot heating by the pump TDTR laser beam. Relative to the HTC measured with non-flowing (static) fluids, we find a 30% increase in the HTC for single-phase water flowing at Re ∼ 1800.

Publication Date

7-20-2016

Publication Title

Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016

Number of Pages

487-494

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/ITHERM.2016.7517588

Socpus ID

84983364680 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84983364680

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