Forced convection and nucleate boiling on a small flat heater in a rectangular duct: Experiments with two working fluids, a 50–50 ethylene glycol—water mixture, and water

• Published in: Proceedings of the Institution of Mechanical Engineers. Part D, Journal of automobile engineering Vol. 223; no. 2; pp. 203 - 219
• Main Authors: Lee, H S, O'Neill, A T
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.02.2009; Sage Publications; SAGE PUBLICATIONS, INC
• Subjects: Analytical and numerical techniques; Antifreeze solutions; Applied sciences; Condensed matter: structure, mechanical and thermal properties; Cross-sections; Data transfer (computers); Engines; Engines and turbines; Equations of state, phase equilibria, and phase transitions; Ethylene glycol; Exact sciences and technology; Flows in ducts, channels, nozzles, and conduits; Fluid dynamics; Fluid flow; Forced convection; Fundamental areas of phenomenology (including applications); Heat transfer; Internal combustion engines; Internal combustion engines: gazoline engine, diesel engines, etc; Liquid-vapor transitions; Mechanical engineering. Machine design; Nucleate boiling; Physics; Robustness; Specific phase transitions; Visual observation; Water; Working fluids; internal combustion engines; nucleate boiling; water; ethylene glycol; flow boiling; forced convection; Rectangular pipe; Forced convection; Flow boiling; Pressure effects; Pipe flow; Experimental study; Operating conditions; Subcooling; Internal combustion engines; Working fluids; Nucleate boiling; Heat transfer
• ISSN: 0954-4070; 2041-2991
• DOI: 10.1243/09544070JAUTO1008

Abstract The heat transfer characteristics for two working fluids, a 50–50 ethylene glycol—water mixture and water, on a small flat heater in a rectangular flow channel were examined for operating conditions in typical internal combustion engines. A particular effort was made to present robust heat transfer data without the constraints of the cross-section of the channel in the regions of forced convection and nucleate boiling, including the onsets of nucleate boiling. The effects of velocity, pressure, and subcooling were discussed using both boiling curves and visual observations.