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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Numerical Study of Thermal Characteristics of Micro Heat Pipe: Role of Various Operating Parameters on Maximum Heat Transport Capability

Get access DOI: 10.1615/IHMTC-2021.2250
pages 1493-1499

Abstract

As a small scale, two-phase, passive thermal device, micro heat pipe (MHP) has promising applications to transfer high heat flux from dissipating components & mitigate the formation of hot spots while minimizing the thermal stress on avionic packages used in spacecraft applications. With water as the working fluid, the current work presents a comparative thermal analysis of a silicon MHP having triangular & square cross- sections with a generalised constant temperature mathematical model. Based on the mass, momentum & energy equations for respective phases (liquid & vapor), the numerical model has considered interfacial mass & energy transfer, wall shear stresses & lastly, interfacial shear stress between liquid & vapor phase. Young-Laplace equation is utilized to address the interfacial pressure change & estimate the thickness of the liquid film. It is observed that, for a given hydraulic diameter, formation of dry-out is prolonged in a triangular channel ensuring higher heat transfer capability. Restricted capillary pumping at the end portion & higher relative velocity between liquid and vapor phase at the inlet portion results in lower thermal performance of a square channel, instead of having more number of corners than the triangular one. A parametric analysis with respect to hydraulic diameter, effective length & temperature of operation is conducted for both the channels & estimation of maximum heat transfer capability is duly presented with appropriate curve fitting.
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