Numerical study on turbulent heat transfer performance of a new compound parallel flow shell and tube heat exchanger with longitudinal vortex generator

2020 ◽  
Vol 164 ◽  
pp. 114449 ◽  
Author(s):  
Chulin Yu ◽  
Haiqing Zhang ◽  
Min Zeng ◽  
Ruojin Wang ◽  
Bingjun Gao
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Performance ◽  
Numerical Study ◽  
Vortex Generator ◽  
Longitudinal Vortex ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Transfer Performance ◽  
Tube Heat Exchanger ◽  
Shell And Tube

Heat Transfer Performance of Finless Flat Tube Heat Exchanger With Vortex Generator

2010 ◽  
Author(s):  
Hajime Onishi ◽  
Haruka Yonekura ◽  
Yukio Tada ◽  
Akira Takimoto
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Vortex Shedding ◽  
Heat Transfer Performance ◽  
Vortex Generator ◽  
Longitudinal Vortex ◽  
Transfer Performance ◽  
Flat Tube ◽  
Longitudinal Vortices ◽  
Tube Heat Exchanger

As the longitudinal vortex is known to be effective in enhancing heat transfer, a three-dimensional unsteady numerical analysis has been made especially for the flow and thermal fields in a unit element of flat tube heat exchanger with vortex generator (VG) in so-called middle Reynolds number range. Both staggered and in-lined arrangements of the tubes with VG are considered and results obtained from the case with VG are compared with those without VG. The study was aimed at the influence of Reynolds number and some geometrical parameters on the heat transfer and the pressure drop. Moreover, as little research has been considered the interaction between transverse vortices and longitudinal vortices in the literatures, the effect is also investigated. It is found that the longitudinal vortex plays an important role in enhancing the local heat transfer by exchanging the fluid from the tube surface region to the fresh fluid of the main flow region and lasts over long distances. Moreover, the longitudinal vortices restrain unsteady transverse vortex shedding. As a result, heat transfer rate for the flat tube with VG case is larger compared to that without VG case. From the view point of pressure drop, increase in pressure drop for the case with VG is not so much larger due to the restraint of transverse vortex shedding. Finally, heat transfer performance becomes higher for the flat tube with VG case compared to that without VG case for the same pumping power.

Structure Size on the Heat Transfer Performance of Shell and Tube Heat Exchanger

2015 ◽  
Vol 778 ◽  
pp. 37-40
Author(s):  
Mei Jin ◽  
Li Zhan ◽  
Han Lin Wu ◽  
Hong Jiao Liu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Baffle Plate ◽  
Tube Heat Exchanger ◽  
F Factor ◽  
Shell And Tube ◽  
Simulation Results ◽  
Gap Height

In this paper, based on the numerical simulation with RNG k-ε model by using commercial code of FLUENT, the effects of the structure size of the shell and tube heat exchanger, such as the baffle spacing and the gap height of baffle plate, on the pressure drop, the heat transfer coefficient and j-f Factor were investigated to obtain the relationship between the baffle spacing and the gap height of baffle plate using the same thermophysical conditions. The numerical simulation results exhibited that there was a non-monotonic relationship between the baffle spacing and the gap height of baffle plate. A better heat transfer performance could be observed under the condition of a smaller value of the baffle spacing and a higher value of the ratio of the gap height to the actual section, or under the condition of a higher value of the baffle spacing and a smaller value of the ratio of the gap height to the actual section. Moreover, under the optimum geometrical condition, the numerical simulation results showed that a smaller difference between the inlet section length and the baffle spacing could give a higher j-f Factor and a better heat transfer performance.

scholarly journals Numerical Study on the Effect of Tube Rows on the Heat Transfer Characteristic of Dimpled Fin

2014 ◽  
Vol 6 ◽  
pp. 637052 ◽  
Author(s):  
Xuehong Wu ◽  
Lihua Feng ◽  
Dandan Liu ◽  
Hao Meng ◽  
Yanli Lu
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Characteristic ◽  
Average Nusselt Number ◽  
Heat Transfer Performance ◽  
Numerical Study ◽  
Transfer Characteristic ◽  
Transfer Performance ◽  
Heat Transfer Characteristics ◽  
Tube Heat Exchanger

The dimpled fin has excellent heat transfer performance and has attracted a lot of attention to apply on the fin and tube heat exchanger. A study presents to investigate the effects of number of tube rows on the air-side heat transfer characteristics of dimpled fin for velocity ranging from 1 to 3 m/s. The Q/Δ P and Q/((Δ P × V)) are used to evaluate the heat transfer performance of the heat exchanger. The results show that the dimpled arrangement can change the mainstream direction, increase the disturbance, and enhance the heat transfer. With the increase of the number of tube rows, the average Nusselt number decreases and Q/Δ P and Q/((Δ P × V)) increase gradually. Compared with the multipipe tube rows, the performance of two-row tube is better.

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