Experimental investigation of two-phase flow distribution in plate-fin heat exchangers
| Autor: | Sunil S. Mehendale, Zhang Zhe, Jin Jin Tian, Yanzhong Li |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
020209 energy
General Chemical Engineering Plate heat exchanger Thermodynamics 02 engineering and technology General Chemistry Mechanics Fin (extended surface) NTU method 020401 chemical engineering Heat exchanger Heat transfer 0202 electrical engineering electronic engineering information engineering Micro heat exchanger Environmental science Plate fin heat exchanger Two-phase flow 0204 chemical engineering |
| Zdroj: | Chemical Engineering Research and Design. 120:34-46 |
| ISSN: | 0263-8762 |
| DOI: | 10.1016/j.cherd.2017.02.003 |
| Popis: | Flow maldistribution causes declining plate-fin heat exchanger thermal-hydraulic performance. A first-of-its kind experimental facility and the related data acquisition system were constructed for studying liquid–gas flow distribution in a plate-fin heat exchanger. The gas Reynolds numbers ranged from 1880 to about 2600 and the inlet dryness (i.e., quality) from 12% to 41%. Two-phase flow maldistribution among the heat exchanger passages was more widespread compared to that of single-phase flow. More specifically, the liquid-phase distribution was more uneven compared to the gas-phase distribution. The inlet flow rate and dryness were identified as the chief factors affecting the distribution of phases in the heat exchanger. For a given inlet dryness, the two-phase flow distribution became increasingly non-uniform with the inlet gas flow rate, consistent with the behavior observed for single-phase flow. Additionally, the non-uniformity in the gas flow distribution decreased and that in the liquid flow non-uniformity increased with increasing inlet dryness fraction. A novel distributor design, with a complementary fluid cavity was also built and tested. Experimental results show that improving the distributor design is very effective in improving the two-phase flow distribution in plate-fin heat exchangers. Based on heat transfer studies conducted at a single Reynolds number of about 1500 and a dryness of 29.2%, the heat exchanger effectiveness was also correlated as a function of the dryness distribution non-uniformity parameter S x . The effectiveness was found to reduce as the flow distribution became more uneven, highlighting the importance of accounting for and controlling the flow maldistribution through proper distributor design. |
| Databáze: | OpenAIRE |
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