NH3 condensation in a plate heat exchanger: Experimental investigation on flow patterns, heat transfer and frictional pressure drop

NH3 condensation in a plate heat exchanger: Experimental investigation on flow patterns, heat transfer and frictional pressure drop

•Flow patterns of NH3 condensation in plate heat exchangers have been observed.•The flow patterns include full film flow and partial film flow.•The sensitivity of heat transfer coefficients is analysed.•Frictional pressure drop is measured.•The studied variables are vapor qualities, mass fluxes and...

Full description

Saved in:
Bibliographic Details
Published in:International journal of heat and mass transfer Vol. 151; p. 119374
Main Authors: Tao, Xuan, Dahlgren, Elias, Leichsenring, Maaike, Infante Ferreira, Carlos A.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01-04-2020
Elsevier BV
Subjects:
Ammonia
Condensation heat transfer
Experimental investigation
Flow distribution
Flow patterns
Flow separation
Fluxes
Heat exchangers
Heat transfer
Heat transfer coefficients
NH3
Plate heat exchanger
Plate heat exchangers
Pressure drop
Two-phase frictional pressure drop
Vapors
Condensation heat transfer
Flow patterns
NH3
Plate heat exchanger
Two-phase frictional pressure drop
Experimental investigation
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Flow patterns of NH3 condensation in plate heat exchangers have been observed.•The flow patterns include full film flow and partial film flow.•The sensitivity of heat transfer coefficients is analysed.•Frictional pressure drop is measured.•The studied variables are vapor qualities, mass fluxes and saturated pressure. This paper investigates NH3 condensation in a plate heat exchanger by visualizing the flow patterns and measuring heat transfer coefficients and frictional pressure drop. Visualization experiments were conducted between 20 and 100 kgm−2s−1. Full film flow takes place at large mass fluxes and intermediate mass fluxes of low vapor qualities, while partial film flow occurs at small mass fluxes and intermediate mass fluxes at high vapor qualities. The heat transfer and frictional pressure drop experiments cover the mass fluxes of 21~78 kgm−2s−1, the averaged vapor qualities of 0.05~0.65 and the saturated pressure of 630 to 930 kPa. Vapor qualities have significant influences on heat transfer and frictional pressure drop. In the tested ranges, the effect of mass fluxes is noticeable on frictional pressure drop, but is moderate on heat transfer. The impact of saturated pressure is small. The heat transfer reflects the change of flow patterns. The frictional pressure drop shows the characteristics of separated flow.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2020.119374