A MODIFIED CORRELATION FOR FLOW BOILING HEAT TRANSFER IN PLATE HEAT EXCHANGERS

Corrugated plate heat exchangers are increasingly used in two-phase flow applications for their flexible and compact size and the efficient heat transfer performance. This paper presents a review of recent studies on the subject and creates a database containing 533 data points from experiment studies. The collected database covers seven workingfluids, 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 degrees-70 degrees, and hydraulic diameter 1.7-4.0 mm. Based on the database a brief comparison between severalprevious correlations are discussed. A new prediction method for flow boiling heat transfer coefficient is generated by multiple regression analysis and modiffing an existing correlation. It was observed that the modified correlation shows a better agreement and predicts 74.3% of data points within +/- 30% error band and 94.9% within +/- 50% error band.