The influence of a lower heated tube on nucleate pool boiling from a horizontal tube
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Authors
Lake, Lannie R.
Subjects
Heat transfer
Nucleate pool boiling
Enhanced tubes
Bundles
Nucleate pool boiling
Enhanced tubes
Bundles
Advisors
Marto, Paul J.
Memory, Stephen B.
Date of Issue
1992-06
Date
June 1992
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Nucleate pool boiling is an essential part of the vast cooling systems today's combatant ship combat systems are dependent upon. Understanding the mechanisms that influence heat transfer in tube bundles in a liquid pool is the stepping stone for improving these cooling systems. This thesis attempts to bridge the gap between single tub performance and bundle performance by studying the effect of a lower heated tube on the heat transfer from an upper tube in a simple two tube bundle. This study concludes that a nucleating lower tube (regardless of the spacings tested between tubes) has a significant positive (i.e. improvement of heat transfer) influence upon an upper tube. This is especially evident for a smooth tube where any hysteresis effects are completely eliminated when the lower tube nucleates at a heat flux of 10kW/m(2) or greater, Furthermore, the only influence for the pitch-to-diameter ratios tested was at the highest heat fluxes for the smooth tubes where a p/d of 1.8 was found to give the maximum heat transfer. No such maximum was obtained for the enhanced tubes.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
126 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.