A Systematic study to investigate the effect of concentration on flow boiling heat transfer characterisics in water ethylene glycol system

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Title: A Systematic study to investigate the effect of concentration on flow boiling heat transfer characterisics in water ethylene glycol system
Author: Bulut, Murat
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.
Record URI: http://hdl.handle.net/1850/12357
Date: 1999-03

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