Levi Campbell

Abstract

Heat transfer, pressure drop, and critical heat flux are experimentally recorded for flowing water in a single 706 pm circular copper channel 158.75 mm long. Heat is supplied by heat transfer oil at specified temperatures to a helical channel in the test section. In contrast to other current experimental techniques for flow boiling in small diameter tubes, a uniform temperature boundary condition is employed rather than a constant heat flux condition. The principal results of these experiments are two-phase flow boiling heat transfer rates, a comparison of two data acquisition methods and their effect on the value of CHF, and an analysis of the time-dependent pressure drop signature during two-phase flow in a minichannel. The two methods used are I) the minichannel surface temperature is held constant between experiments and mass flux is varied, and II) the mass flux is held constant between experiments and minichannel surface temperature is varied. The range of experiments includes mass fluxes of 43.8-3070 kg/m2s and wall temperatures of 100C-171.2C. In all cases the test section water inlet is subcooled to between 72.9C and 99.6C. The inlet pressures used are 1.1-230.5 kPa (gage).

Library of Congress Subject Headings

Heat--Transmission--Research; Heat exchangers--Research; Heat-transfer media--Research

Publication Date

9-1-2003

Document Type

Thesis

Department, Program, or Center

Mechanical Engineering (KGCOE)

Advisor

Kandlikar, Satish

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: QC320.3 .C36 2003

Campus

RIT – Main Campus

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