期刊
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
卷 84, 期 -, 页码 13-25出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2017.08.006
关键词
Heat transfer; LNG; Shell side; Spiral wound heat exchanger; Two-phase flow boiling
资金
- National Natural Science Foundation of China [51674165, 51504149]
- Program of Shanghai Academic Research Leader [16XD1401500]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51521004]
For designing LNG spiral wound heat exchangers (SWHE), the boiling heat transfer mechanism of two-phase hydrocarbon refrigerant flowing downward in shell side should be known. In this study, an explosion-proof experimental rig was established for measuring heat transfer coefficients (HTC) and observing flow patterns. The test section contains three-layer tube bundles to emulate the actual structure and flow conditions of an SWHE. Propane as one main component of shell-side refrigerant is used as the tested fluid. The experimental conditions cover heat fluxes of 4 similar to 10 kW center dot m(-2), mass fluxes of 40 similar to 80 kg (m(2)center dot s)(-1) and vapor qualities of 0.2 similar to 1.0. The results indicate that HTC initially increases and then decreases with the increment of vapor quality, representing a maximum at a vapor quality of 0.8 similar to 0.9; the effect of heat flux on HTC increases with the increment of heat flux. A correlation of HTC was developed covering 98% of the experimental data within a deviation of +/- 20%. (C) 2017 Elsevier Ltd and IIR. All rights reserved.
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