Numerical study on shell-side flow and heat transfer of spiral-wound heat exchanger under sloshing working conditions

2018 ◽  
Vol 134 ◽  
pp. 287-297 ◽  
Author(s):  
Yan Ren ◽  
Weihua Cai ◽  
Yiqiang Jiang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Working Conditions ◽  
Numerical Study ◽  
Shell Side ◽  
Flow And Heat Transfer ◽  
Side Flow ◽  
Spiral Wound

Geometrical Parametric Analysis of Flow and Heat Transfer in the Shell Side of a Spiral-Wound Heat Exchanger

2014 ◽  
Vol 36 (9) ◽  
pp. 790-805 ◽  
Author(s):  
Min Zeng ◽  
Gaopeng Zhang ◽  
Ye Li ◽  
Yuzhen Niu ◽  
Yuan Ma ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Parametric Analysis ◽  
Shell Side ◽  
Flow And Heat Transfer ◽  
Spiral Wound

Effects of Baffle Overlap Proportion on Shell-Side Performance of Shell and Tube Heat Exchanger With Helical Baffles

2013 ◽  
Author(s):  
Bin Gao ◽  
Qincheng Bi ◽  
Zesen Nie
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Shell Side ◽  
Tube Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Shell And Tube ◽  
Side Flow

Different overlap configurations of discontinuous helical baffles affect the flow pattern of the shell-side fluid directly, and thus there is a significant impact on the flow and heat transfer characteristics of the shell-side fluid. In the present paper, experiments were carried out to study the impact of baffle overlap proportion on the shell-side flow and heat transfer performance of the shell-and-tube heat exchanger with helical baffles (STHEHB). Two different shell-side friction factors, the friction factor per helical pitch (fs,1B) and the friction factor per tube length (fs,1m), were defined based on different reference lengths. The results showed that, since the baffle overlap proportion leads to different helical pitch as well as flow fields in shell side, opposite conclusions are obtained by choosing different reference length. Based on the same Reynolds number, the shell-side Nusselt number of the STHEHB with 10% baffle overlap is higher than that with 50% baffle overlap. The reason is that the larger baffle overlap proportion produces more serious leak flows and weakens the heat transfer in shell side. The comparison of heat transfer coefficient per unit pressure drop versus shell-side flow rate showed that the STHEHB with smaller baffle overlap proportion has better comprehensive heat transfer performance, but the difference between the two decreases gradually with the increase of the flow rate.

Numerical study on shell-side saturated boiling heat transfer in spiral wound heat exchanger

2018 ◽  
Vol 140 ◽  
pp. 657-670 ◽  
Author(s):  
Yan Ren ◽  
Yiqiang Jiang ◽  
Weihua Cai ◽  
Zhiyong Wu ◽  
Shulei Li
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Boiling Heat Transfer ◽  
Numerical Study ◽  
Shell Side ◽  
Saturated Boiling ◽  
Spiral Wound

Numerical study on the flow characteristic of shell-side film flow of floating LNG spiral wound heat exchanger

2022 ◽  
Vol 187 ◽  
pp. 122198
Author(s):  
Yan Ren ◽  
Wei-hua Cai ◽  
Yi-qiang Jiang ◽  
Wei-dong Wu ◽  
Qi-guo Yang ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Flow Characteristic ◽  
Film Flow ◽  
Numerical Study ◽  
Shell Side ◽  
Spiral Wound

scholarly journals Performance Analysis and Design Optimization of Shell and Tube Heat Exchangers

2021 ◽  
Author(s):  
praveen math
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Pressure Loss ◽  
Fluid Flows ◽  
Hot Water ◽  
Flow Conditions ◽  
Shell Side ◽  
Shell And Tube ◽  
Side Flow

Abstract Shell and Tube heat exchangers are having special importance in boilers, oil coolers, condensers, pre-heaters. They are also widely used in process applications as well as the refrigeration and air conditioning industry. The robustness and medium weighted shape of Shell and Tube heat exchangers make them well suited for high pressure operations. The aim of this study is to experiment, validate and to provide design suggestion to optimize the shell and tube heat exchanger (STHE). The heat exchanger is made of acrylic material with 2 baffles and 7 tubes made of stainless steel. Hot fluid flows inside the tube and cold fluid flows over the tube in the shell. 4 K-type thermocouples were used to read the hot and cold fluids inlet and outlet temperatures. Experiments were carried out for various combinations of hot and cold water flow rates with different hot water inlet temperatures. The flow conditions are limited to the lab size model of the experimental setup. A commercial CFD code was used to study the thermal and hydraulic flow field inside the shell and tubes. CFD methodology is developed to appropriately represent the flow physics and the procedure is validated with the experimental results. Turbulent flow in tube side is observed for all flow conditions, while the shell side has laminar flow except for extreme hot water temperatures. Hence transition k-kl-omega model was used to predict the flow better for transition cases. Realizable k- epsilon model with non-equilibrium wall function was used for turbulent cases. Temperature and velocity profiles are examined in detail and observed that the flow remains almost uniform to the tubes thus limiting heat transfer. Approximately 2/3 rd of the shell side flow does not surround the tubes due to biased flow contributing to reduced overall heat transfer and increased pressure loss. On the basis of these findings an attempt has been made to enhance the heat transfer by inducing turbulence in the shel l side flow. The two baffles were rotated in opposite direction to each other to achieve more circulation in the shell side flow and provide more contact with tube surface. Various positions of the baffles were simulated and studied using CFD analysis and th e results are summarized with respect to heat transfer and pressure loss.

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