scholarly journals Heat transfer enhancement and field synergy analysis of vacuum collector tube with inserted rotor

AIP Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 045224
Author(s):  
Zhi Geng ◽  
Jifeng Gao ◽  
Haochen Liu ◽  
Ziyuan Mo ◽  
Yujiong Gu ◽  
...  
Author(s):  
Hosseinali Soltanipour ◽  
Nader Pourmahmoud ◽  
Iraj Mirzaee

In this paper, flow structure, heat transfer, and entropy generation in an internally finned curved microchannel are studied. Three dimensional numerical simulations are performed using a finite volume approach. The effect of fin height, mass flow rate, and curvature radius on heat transfer enhancement and pressure losses are explored. The field synergy principle is employed to explain the heat transfer enhancement mechanism. The second law analysis is also performed to indicate the influence of fins on the entropy generation in the curved microchannel. It is found that regardless of mass flow rate, the fin height of a* = 0.35 provides the maximum heat transfer enhancement. Numerical results reveal that the ratio of heat transfer coefficient (and pressure drop) of finned microchannel to unfinned microchannel depends on the curvature radius and mass flow rate. The field synergy principle and the second law analysis confirm that for the fin height of a* = 0.35, the microchannel has the optimal thermal performance.


2013 ◽  
Vol 561 ◽  
pp. 101-106
Author(s):  
Zhen Zhang ◽  
Hua Yan ◽  
Yu Mei Ding ◽  
Chang Feng Guan ◽  
Wei Min Yang

Based on the advantages of polymer materials over other materials, rotors which are made of the polymer material, are the functional elements of the rotor-assembled strand, and rotate under certain mass flow rate to obtain heat transfer enhancement and online automatic cleaning. The paper carried out numerical studies on heat transfer and friction loss characteristics of the tube fitted with rotors of different spaces. The comparison of the field synergy angle between plain tube and the tube fitted with rotors was also presented in the paper. The numerical data had good agreement with the experimental data. The numerical studies indicated that the field synergy angle of the rotors inserted tube were significantly smaller than that of the plain tube, which validated that the rotors could significantly enhance heat transfer process and had a better comprehensive performance of heat transfer enhancement though extra friction loss was generated. In addition, both the Nusselt number and friction factor of the tube fitted with rotors increased with the increasing space between rotors; the thermal performance factor of the rotors were all higher than 1, which validated the heat transfer enhancement function of the rotors; meanwhile, the thermal performance factor increased with the space between rotors.


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