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RESEARCH PAPERS: Boiling Heat Transfer

Nucleate Pool Boiling of a TURBO-B Bundle in R-113

[+] Author and Article Information
S. B. Memory

Department of Mechanical Engineering, University of Miami, Coral Gables, FL 33124

S. V. Chilman, P. J. Marto

Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93940

J. Heat Transfer 116(3), 670-678 (Aug 01, 1994) (9 pages) doi:10.1115/1.2910921 History: Received February 01, 1993; Revised August 01, 1993; Online May 23, 2008

Abstract

Heat transfer measurements were made during nucleate boiling of R-113 from a bundle of 15 electrically heated, copper TURBO-B tubes arranged in an equilateral triangular pitch, designed to simulate a portion of a flooded evaporator. Five of the tubes that were oriented in a vertical array on the centerline of the bundle were each instrumented with six wall thermocouples. For increasing heat flux, the incipient boiling wall superheat of upper tubes decreased as lower tubes were activated. In the boiling region at low heat fluxes (≈ 1 kW/m2 ), the average bundle heat transfer coefficient was 4.6 times that obtained for a smooth tube bundle (under identical conditions) and 1.6 times greater than that obtained for a single TURBO-B tube; a similar bundle factor has been reported for a smooth tube bundle. At high heat fluxes (100 kW/m2 ), the average bundle heat transfer coefficient was 3.6 times that of a smooth tube bundle. Furthermore, there was still a significant bundle factor (1.22), contrary to a smooth tube bundle, where all effect of lower tubes was eliminated at high heat fluxes.

Copyright © 1994 by The American Society of Mechanical Engineers
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