Li, W. and Yu, Z. (2021) Cavitating flows of organic fluid with thermodynamic effect in a diaphragm pump for organic Rankine cycle systems. Energy, 237, 121495. (doi: 10.1016/j.energy.2021.121495)
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Abstract
Diaphragm pumps often experience cavitation and subsequent fluid flow oscillation when delivering an organic fluid in small/micro scale organic Rankine cycle (ORC). The cavitation behaviour of diaphragm pumps has rarely been investigated for organic fluids so far. Three-dimensional, unsteady cavitating flows of organic fluid R245fa in a diaphragm pump were simulated with ANSYS 2019R2-CFX in suction stroke in terms of the k- turbulence model, the ZGB cavitation model, rigid body motion model for one-dimensional motion of valve and moving mesh technique for the first time. The thermodynamic effect in cavitation of R245fa was considered. The vapour volume fraction threshold for cavitation inception was determined, and the cavitation inception and cavitation developed states were identified, and vortex production and entropy generation rate during cavitation were clarified. Cavitation inception emerges at the edge of the valve seat, then on the valve surface. With cavitating development, the pressure and force on the valve, valve opening, and velocity oscillate violently due to vapour bubble collapse cycles. Expansion cavitation and flow induced cavitation happen in sequent at different crank rotational angles. The maximum temperature depression is 0.549K in the cases studied. The volume-integrated entropy generation rate in the valve chamber correlates to cavitation states.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Li, Dr Wenguang and Yu, Professor Zhibin |
| Authors: | Li, W., and Yu, Z. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Energy |
| Publisher: | Elsevier |
| ISSN: | 0360-5442 |
| ISSN (Online): | 1873-6785 |
| Published Online: | 21 July 2021 |
| Copyright Holders: | Copyright © 2021 The Authors |
| First Published: | First published in Energy 237: 121495 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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