Abstract

Corrugated plate heat exchangers are increasingly used in two-phase flow applications for their flexible compact size and the efficient heat transfer performance. This paper presents a brief review of recent studies on the flow boiling in plate heat exchangers and creates a database containing 533 data points from previous experiment studies. The collected database covers seven working fluids, a wide range of vapor quality (both mean and local) 0.01-0.94, heat flux 0.5-46 kW m-2, mass flux 5.5-137 kg m-2 s-1, chevron angle 30°-70°, and hydraulic diameter 1.7-4.0 mm. Based on the database a brief comparison between several previous correlations are discussed. A new prediction method for flow boiling heat transfer coefficient is developed by multiple regression analysis and modifying an existing correlation. A new criterion about the transition from micro- to macro-scale was introduced with a combined dimensionless number Bd·Rel0.5 which attempts to comprehensively consider four types of forces during flow boiling. It was observed that the modified correlation shows a better agreement and predicts 74.3% and 94.9% of total data points within ±30% and ±50% error bands respectively.

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