Influence of different inlet pressures on the flow field and heat transfer characteristics of impinging jets

2018 International Conference on New Energy and Future Energy System

Gu, H.W.^1 ; Wang, J.F.^1,2 ; Xie, J.^1,2

College of Food Science and Technology, Shanghai Ocean University, Shanghai, Shanghai

201306, China^1

Shanghai Prof. Technol. Serv. Platform on Cold Chain Equip. Performance and Energy Saving Evaluation, Shanghai Engineering Research Center of Aquatic-Product Processing and Preservation, Shanghai

201306, China^2

关键词: Exit velocity;    Frozen food;    Heat transfer characteristics;    Impinging jet;    Inlet pressures;    Pressure change;    Pressure ranges;    Research object;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012085/pdf
DOI  :  10.1088/1755-1315/188/1/012085

来源: IOP

【 摘 要 】

In this paper, the V type slit nozzle in a quick-frozen machine is used as the research object. Under the same air supply conditions, only the pressure entering the impinging jet region is changed. The impact on the flow field and heat transfer characteristics of the impinging jet is observed. The results show that with the increase of the inlet pressure, the velocity of the exit of the V-slit nozzle will change greatly. In this pressure range, the exit velocity of the nozzle is relatively uniform, and frozen products will not be blown off. Therefore, it is beneficial to frozen food safely and effectively. Along the direction of cross flow, the Nusselt number of the steel strip surface of the V slit nozzle will change when the pressure changes, and it will increase with the increase of pressure. Therefore, the heat transfer characteristics of the V type slit nozzle on the surface of the steel strip are stronger and stronger under the increase of the inlet pressure, and the uniformity is also very good.