Comparisons of Performances of a Flat Tube Bank Fin Model Mounted Vortex Generators and the Real Heat Exchanger

Wang, L. B.; Yang, Lijun; Lin, Zhihong; Dong, Yuanxin; Liu, S.; Zhang, Y. H.

doi:10.1080/08916150902950103

Cited by 10 publications

(5 citation statements)

References 30 publications

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“…As such, the VGs can be generated either by punching the fin surface or through addition by welding. In a recent work, Wang et al [44] concluded that the effect of punching for an industrial-scale heat exchanger with multiple VGs is rather insignificant. It is interesting that for a refrigeration application as a condenser [68], the VG was manufactured using wire-EDM where as many as 3,500 winglet elements were used.…”

Section: Summary Of Resultsmentioning

confidence: 99%

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Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

Biswas

Chattopadhyay

Sinha

2012

Heat Transfer Engineering

109

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This paper summarizes the current state of the art related to improvement of the heat exchanger surfaces using streamwise longitudinal vortices. Primarily, the improvements related to fin-tube cross-flow heat exchangers and the plate-fin heat exchangers have been addressed. Protrusions in certain forms, such as delta wings or winglet pairs, act as vortex generators, which can enhance the rate of heat transfer from the heat-exchanger surfaces that may be flat or louvered. The strategically placed vortex generators create longitudinal vortices, which disrupt the growth of the thermal boundary layer, promote mixing between fluid layers, and hence lead to augmentation in heat transfer. The flow fields are dominated by swirling motion associated with modest pressure penalty. Heat transfer is augmented substantially for all the proposed configurations of the longitudinal vortex generators, such as delta wings, rectangular winglet pairs, and delta winglet pairs, with varying degree of pressure penalty. Both computational and experimental investigations on flow and heat transfer in the heat exchanger passages with built-in vortex generators are revisited and summarized.

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Section: Summary Of Resultsmentioning

confidence: 99%

“…A naphthalene sublimation experiment in a wind tunnel was conducted by Wang et al [44] and showed that the results interpreted from mass transfer data are quite reliable for estimation of energy transfer. The geometry in the setup was based on a typical locomotive radiator.…”

Section: Experimental Methodsmentioning

confidence: 99%

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

Biswas

Chattopadhyay

Sinha

2012

Heat Transfer Engineering

109

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“…The experiments of the real heat exchanger performance were carried out on the special test platform which can strictly impose its real working conditions on the diesel locomotive to the exchanger. The detailed data reduction of real heat exchanger performance to obtain the air side Nu m,a and f a was presented in reference [34]. Figure 7a presents the comparison of the air side average Nu m,a obtained by the numerical method with that obtained by the experiments of the real heat exchanger as a function of Re a for the given geometrical parameters.…”

Section: Validation Of Numerical Resultsmentioning

confidence: 99%

A Multi-Domain Coupled Numerical Method for a Flat Tube Bank Fin Heat Exchanger with Delta-Winglet Vortex Generators

Lin

Wang

2014

Numerical Heat Transfer, Part A: Applications

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Along with the improvement of numerical methods and the development of computer power, using a numerical method to design a tube bank fin heat exchanger becomes increasingly possible. In real working conditions, the conjugate heat transfer process arises in this type of exchanger. To provide a feasible numerical model and its relevant method to properly assess the thermal performance of exchanger, in this article, a multi-domain coupled numerical method is presented, in which the conduction in solid regions and the convection in flow regions are calculated together with a fully coupled manner. The reliability of a numerical method was tested through comparing average numerical results with experimental results of a real heat exchanger. The results reveal that the multi-domain coupled numerical method can achieve more accurate positions of the interfaces, arrange the orthogonal grids close to the interfaces, and use more reasonable criteria of convergence. Thus, we have achieved reasonable results that agree with the experimental data of the real heat exchanger under the working condition within 10% deviation in the Reynolds number region studied, and got overall heat transfer coefficient of a flat tube bank fin heat exchanger.

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“…Winglet fin is another kind of fins, the winglet can be rectangular or triangular. Wing or winglet can be used in plate heat exchanger and tube-fin heat exchanger, the early studies of their heat transfer performance and applications in compact heat exchangers are reported by M. Fiebig, et al [2][3] Many investigations have been down on heat transfer performance for heat exchangers with wave fin, slit fin, louvered fin and delta winglet fin experimentally or numerically [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 98%

Study of heat transfer performance of tube-fin heat exchanger with interrupted annular groove fin

Zhang

Wang

Han

2011

2011 International Conference on Consumer Electronics, Communications and Networks (CECNet)

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The numerical analysis on convective heat transfer behavior and pressure drop characteristics of staggered circular tube bank fin heat exchanger with smooth fin and with interrupted half annular groove fin is carried out under the conditions of different tube rows (1,2,3,4,5), different fin spans (1.5mm, 2mm, 2.5mm) and different annular angles of interrupted half annular groove(30°,50°,70°), in addition, the velocity fields and the temperature fields of the structures are obtained. The results show that the ability of heat transfer could be enhanced by increasing tube rows, fin spans and annular angle of interrupted half annular groove in certain range, and the Nu number increases with the increase of Re number, whereas the resistance coefficient decreases with the increase of Re number in the heat exchangers both for the smooth fins and the interrupted half annular groove fins. The features of flow and heat transfer for heat exchanger with interrupted half annular groove fin are obtained by analysis of the formation, development and influence area of the vortices generated by interrupted half annular grooves.

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Comparisons of Performances of a Flat Tube Bank Fin Model Mounted Vortex Generators and the Real Heat Exchanger

Cited by 10 publications

References 30 publications

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

A Multi-Domain Coupled Numerical Method for a Flat Tube Bank Fin Heat Exchanger with Delta-Winglet Vortex Generators

Study of heat transfer performance of tube-fin heat exchanger with interrupted annular groove fin

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