Murat Bulut

Abstract

Mixtures of ethylene glycol and water are employed in cooling engines in automotive applications. To avoid two-phase flow in the engine, the mixture is subcooled in the radiator before entering the engine block. Heat transfer is therefore essentially under subcooled flow boiling conditions. Very little information is available in the literature on the subcooled flow boiling (flow boiling with subcooled liquid) characteristics of this mixture and there are no predictive methods established in this region. In the present investigation heat transfer in the nucleate flow boiling of dilute aqueous binary mixtures was measured and experimental data were compared with available correlating methods developed for binary mixtures. The concentration range from pure water to 40 percent ethylene glycol solution is tested under these conditions. Eighteen different concentrations have been investigated. Liquids were boiled at atmospheric pressure on a rectangular flow channel. The experimental set up consists of a 9.5 mm circular heater placed on the lower wall of a 3 mm x 40 mm horizontal channel. The results indicate that increasing the concentration of ethylene-glycol in water deteriorates the heat transfer coefficients as compared to the case of pure water at the same wall superheat.

Library of Congress Subject Headings

Ethylene glycol; Heat--Transmission; Automobiles--Motors--Cooling

Publication Date

3-1-1999

Document Type

Thesis

Department, Program, or Center

Mechanical Engineering (KGCOE)

Advisor

Kandlikar, S.

Advisor/Committee Member

Ghosh, A.

Advisor/Committee Member

Nye, A.

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 .B85 1999

Campus

RIT – Main Campus

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