Investigation on laminar convection heat transfer in fin-and-tube heat exchanger in aligned arrangement with longitudinal vortex generator from the viewpoint of field synergy principle

2007 ◽  
Vol 27 (14-15) ◽  
pp. 2609-2617 ◽  
Author(s):  
J.M. Wu ◽  
W.Q. Tao
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Convection Heat Transfer ◽  
Vortex Generator ◽  
Longitudinal Vortex ◽  
Convection Heat ◽  
Field Synergy ◽  
Field Synergy Principle ◽  
Tube Heat Exchanger ◽  
Laminar Convection

scholarly journals Numerical simulation of heat transfer augmentation in fin-and-tube heat exchanger with various number of rows of concave rectangular winglet vortex generator

2018 ◽  
Vol 159 ◽  
pp. 02012 ◽  
Author(s):  
Syaiful ◽  
Imam Syarifudin ◽  
Maria F. Soetanto ◽  
Myung-whan Bae
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Convection Heat Transfer ◽  
Vortex Generator ◽  
Convection Coefficient ◽  
Convection Heat ◽  
Convection Heat Transfer Coefficient ◽  
Tube Heat Exchanger

The passive method by using a vortex generator (VG) is an effective method for the improvement of convective heat transfer. This study is focused on usage of concave rectangular winglet vortex generator (CRW VG) for improving convective heat transfer in a fin-and-tube heat exchanger using numerical simulation. Concave rectangular winglet pairs (CRWP) and rectangular winglet pairs (RWP) VGs were mounted inside the gap between fins (gas side) with variations of the number of VG pairs of rows. Inlet air velocity variations expressed by the Reynolds numbers were ranged from 364 to 689. Augmentation of heat transfer is indicated by the ratio value of heat transfer convection coefficient between cases using VG and that without using VG (baseline). The results show that the convection heat transfer coefficient for cases using CRWP VG is higher than that using RWP VG. Convection heat transfer coefficient increases up to 102% by mounting CRWP VG at Re = 364. However, the increase in convection coefficient is accompanied by a rise in pressure drop to 216.8%.

scholarly journals Effect of perforated concave delta winglet vortex generators on heat transfer augmentation of fluid flow inside a rectangular channel: An experimental study

2018 ◽  
Vol 204 ◽  
pp. 04015
Author(s):  
Syaiful ◽  
MSK Tony SU ◽  
Nazaruddin Sinaga ◽  
Retno Wulandari ◽  
Myung-whan Bae
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Transfer Coefficient ◽  
Convection Heat Transfer ◽  
Vortex Generator ◽  
Longitudinal Vortex ◽  
Convection Heat ◽  
Convection Heat Transfer Coefficient ◽  
Delta Winglet

Compact heat exchanger with gas as a heat exchange medium is widely used in power plants, automotive, air conditioning, and others. However, the gas has a low thermal conductivity resulting in high thermal resistance causing a low rate of heat transfer. Therefore an improvement to the convection heat transfer coefficient is necessary. One way to enhance the convection heat transfer coefficient is to use a longitudinal vortex generator. However, the increase in convection heat transfer coefficient is followed by an increase in pressure drop. Therefore, this work aims to improve the convection heat transfer coefficient with a low pressure drop. To achieve this goal, experiments were carried out by perforating a longitudinal vortex generator with a diameter of 5 mm with variations in holes number one, two and three. Two types of longitudinal vortex generators are compared. The experimental results show that the convection heat transfer coefficient for the case of perforated concave delta winglet vortex generator is only decreased by 1% from that without a hole, while the pressure drop is decreased by 11.6%.

Computer-aided engineering analysis for the performance augmentation of a fin-tube heat exchanger using vortex generator

2019 ◽  
Vol 28 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Sachin Gupta ◽  
Aditya Roy ◽  
Arvind Gupta
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Simulations ◽  
Vortex Generator ◽  
Longitudinal Vortex ◽  
Tube Heat Exchanger ◽  
Significant Augmentation ◽  
The Common ◽  
Fin Tube ◽  
And Performance

The heat transfer performance of fin-tube heat exchangers can be enhanced with the help of longitudinal vortex generators. In this work, we investigate the effect of employing a rectangular winglet having a punched hole on heat transfer and flow resistance characteristics in a fin-tube heat exchanger with the help of numerical simulations. Studies were performed on two configurations, namely, common flow down and common flow up at upstream and downstream locations. Performance characteristics such as Colburn’s factor ( j), friction factor ( f), and performance evaluation criterion were considered for evaluating the thermohydraulic performance. Investigations were performed considering Reynolds number in the range of 1500–9000, keeping the angle of attack as 45°. The shear stress transport k-ω turbulence model was used for performing numerical simulations. A significant augmentation of up to 71% in the thermohydraulic performance of fin-tube heat exchanger was observed with the common flow down configuration located upstream over the common flow up configuration located upstream, which displayed the least improvement.

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