Call number:
ZSP-202-335
In:
Research report
Description / Table of Contents:
CONTENTS: Abstract. - Preface. - Ňomenclature. - Introduction. - Experimental apparatus and procedure. - Testspecimens. - Bubble frequency and velocity. - Analysis of experimental results. - Discussion. - Summary. - Literature cited.
Description / Table of Contents:
An experimental study of the heat transfer characteristics of a bubble-driven water jet on an ice surface was conducted. Two Lucite columns, one 1.829 m high and 0.286 m in diameter and the other 1.219 m high and 0.140 m in diameter were used. Water levels were maintained at 0.762 and 1.524 m in the large column and 0.840 m in the small column. Hypodermic needles with openings of 0.152, 0.406 and 0.838 mm were used for bubble formation. The air flow rate was varied from 7.39 X 10^-8 to 9.91 X I0^-7 m^3/s. In all, 171 experimental runs were conducted. The results can be correlated by Nu = 0.1735 (Rei)^0.848 with a correlation coefficient of 0.84, in which Nu is defined in terms of average heat transfer coefficient h, sample diameter Ds, and thermal conductivity of water kw. Rei is defined in terms of diameter of the impinging water jet at the ice surface, Di, the centerline arrival water velocity vc and the kinematic viscosity of water uw.
Type of Medium:
Series available for loan
Pages:
vi, 16 S. : graph. Darst.
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 335
URL:
http://acwc.sdp.sirsi.net/client/search/asset/1014860
Branch Library:
AWI Library
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