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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-431-1

ISBN Online: 978-1-56700-430-4

First Thermal and Fluids Engineering Summer Conference
August, 9-12, 2015 , New York City, USA

SATURATION NUCLEATE BOILING OF PF-5060 ON INCLINED DIMPLED SURFACES

Get access (open in a dialog) pages 1991-1996
DOI: 10.1615/TFESC1.mph.012561

Abstract

Pool boiling experiments are performed to investigate the effects of surface inclination on nucleate boiling heat transfer coefficient and the critical heat flux (CHF) for PF-5060 dielectric liquid on 10 ×10 mm, uniformly heated Copper (Cu) surfaces with machined circular dimples. The dimples, 300, 400, and 500 µm in diameter and 200 µm deep, have a triangular lattice with a pitch-to-diameter ratio of 2.0. The experiments varied the surface inclination angle from 0° (upward facing) to 180° (downward facing. In the upward facing orientation, the surface with 400 µm diameter dimples gives the highest maximum saturation boiling heat transfer coefficient, hMNB, of ~1.04-1.08 W/cm2 K and CHF of 19.3 W/cm2. The values of CHF and hMNB decrease with increasing inclination to the lowest values in the downward facing orientation of ~36% and ~33% of those in the upward facing orientation, respectively.