Abstract

Plate heat exchangers are widely used in various industries for many years. The corrugated channels on the plates effectively enhance the turbulence of flow boiling and complicate the prediction of pressure drop. This paper presents a brief review of the influence factors of frictional pressure drop during flow boiling in plate heat exchangers. Experimental data points of frictional pressure drop were collected from published literature to develop a general correlation. The database contained 454 data points, covering eight refrigerants, a mass flux range of 5.5-137 kg m-2 s-1, a heat flux range of 0-30 kW m-2, a vapor quality range of 0.07-0.95, a saturation pressure range of 0.11-2.7 MPa, a chevron angle between 30°-70° and a hydraulic diameter range of 1.7-5.4 mm. In this work, several existing correlations were compared with the database, and all of them seem to fail to give an acceptable prediction. A new correlation was proposed with multiple regression analysis in terms of the two-phase Fanning friction factor. The new method showed good agreement and predicted 63.2% and 92.9% of the data points within a ±30% and a ±50% errors, respectively.

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