Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Influence of nanoparticles on heat transfer characteristics of supercritical carbon dioxide fluid
| DOI: | 10.11809/bqzbgcxb2023.05.021 |
| Keywords: | nanoparticle; supercritical CO2; numerical simulation; heat transfer characteristics; temperature distribution |
| Abstract: | For supercritical carbon dioxide nanofluids, this paper studies the effects of volume fraction and wall heat flux of nanoparticles on their heat transfer characteristics in horizontal tubes by numerical simulation. The results show that when the inlet flow rate is given, doping of nanoparticles will increase the fluid density and reduce the inlet flow rate, which is not beneficial to heat transfer. However, this doping increases the thermal conductivity of the nanofluids significantly, which is helpful to improve the transfer rate of wall heat flow into the volume phase space. Therefore, the larger the volume fraction of nanoparticles, the faster the temperature of the bulk phase fluid will warm up along the path. When the wall heat flux q =30 kW·m -2 , heat transfer is enhanced by nanofluids along the flow direction. At a higher heat flux, the heat transfer enhancement only occurs in the early stage of fully developed flow, and the heat transfer deteriorates significantly at the end of the heat exchange tube with an increasing volume fraction. |
| Issue: | Vol. 44 No. 5 (2023) |
| Published: | 2023-05-28 |
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