A new approach in evaluation of thermal contact conductance of tube–fin heat exchanger

Ding, Tao; Li, Dayong; Peng, Yinghong; Du, Zhaohui

doi:10.1016/j.applthermaleng.2010.05.001

Cited by 18 publications

(7 citation statements)

References 8 publications

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“…Pervez et al analyzed the expanded tube thickness and the expansion force according to the expansion ratio [4]. Numerical simulations were used to study the effect of the expansion ratio on the gap between the tube and the fin and on the thermal conductance after expansion [5]. Although the speed of the expansion ball did not have a large effect on the expansion force [6], the geometry tolerances produced when manufacturing the tube can compromise the heat transfer performance [7].…”

Section: Introductionmentioning

confidence: 99%

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

et al. 2018

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Abstract:In the expansion process of a fin-tube heat exchanger, the process variables and shape of the expansion ball affect the deformation of the tube's inner grooves, the adhesion, and the expansion force. These factors influence the efficiency of heat transfer and the lifetime of the expansion equipment. Therefore, this study analyzed the influential variables of the tube expansion process as well as the expansion ball design through experiments and simulations. A new method was proposed to determine the severity of adhesion in the tube's inner grooves using the expansion force rate. Expansion experiments with Al tubes show that the expansion force decreases when using a lubricant with high viscosity and when the lubricant remains on the expansion ball for a longer duration. Finite element analysis was also performed to examine the expansion of Cu tubes, which showed that the expansion force was higher when using expansion ball shapes that have higher contact area between the ball and tube surface. The radius of curvature of the expansion ball also influenced the expansion force. However, increasing the ratio of the radial force to the expansion force increased the deformation of the tube's inner grooves.

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Section: Introductionmentioning

confidence: 99%

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

et al. 2018

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“…It was also added that, due to the momentum created in the region, transport of the heat was greatly affected. From the ancient, many experiments and numerical approaches [22][23][24][25][26] were applied to insert the circular tubes as the tabulator creator or vortex generator to enhance the heat transfer in the rectangular channel in such a way a valuable heat exchanger can be made. Also, much literature [27][28][29] can be found that developed the correlations among the fluid dynamics parameter and the non-dimensional parameter which might help design the heat exchanger of any shape.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Non-Isothermal Turbulent Flows Through Circular Rings of Steel

Memon¹,

Memon²,

Bhatti³

et al. 2022

Computers, Materials &Amp; Continua

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This article is intended to examine the fluid flow patterns and heat transfer in a rectangular channel embedded with three semi-circular cylinders comprised of steel at the boundaries. Such an organization is used to generate the heat exchangers with tube and shell because of the production of more turbulence due to zigzag path which is in favor of rapid heat transformation. Because of little maintenance, the heat exchanger of such type is extensively used. Here, we generate simulation of flow and heat transfer using nonisothermal flow interface in the Comsol multiphysics 5.4 which executes the Reynolds averaged Navier stokes equation (RANS) model of the turbulent flow together with heat equation. Simulation is tested with Prandtl number (Pr = 0.7) with inlet velocity magnitude in the range from 1 to 2 m/sec which generates the Reynolds number in the range of 2.2 × 10 5 to 4.4 × 10 5 with turbulence kinetic energy and the dissipation rate in ranges (3.75 × 10 −3 to 1.5 × 10 −2 ) and (3.73 × 10 −3 −3 × 10 −2 ) respectively. Two correlations available in the literature are used in order to check validity. The results are displayed through streamlines, surface plots, contour plots, isothermal lines, and graphs. It is concluded that by retaining such an arrangement a quick distribution of the temperature over the domain can be seen and also the velocity magnitude is increasing from 333.15% to a maximum of 514%. The temperature at the middle shows the consistency in value but declines immediately at the end. This process becomes faster with the decrease in inlet velocity magnitude.

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“…As the efficiency of heat exchanger is directly affected by the forms of the fin and the tube, the effect of various forms of fins and tubes has previously been studied by calculating thermal contact conductance between fins and tubes. 1 Furthermore, Tang et al 2 have proposed a new methodology for improving the thermal contact conductance performance at the expansion forming process. Recently, the effect of tube geometry on heat exchanger efficiency has been studied, 3 and heat exchanger coefficients and pressure drop for various tube geometries have been computed.…”

Section: Introductionmentioning

confidence: 99%

A new methodology for detecting adhesion location in aluminum tube expansion

Kwon

Kim

Han

et al. 2017

Advances in Mechanical Engineering

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During the expansion forming of aluminum tube, the efficiency of heat exchanger diminishes due to the adhesion of groove and expansion ball inside the tube. Despite its importance, a limited number of researches on the adhesion problems in aluminum tube expansion have been published. This study aims to analyze the adhesion occurring during the expansion forming of aluminum tube for heat exchanger and to identify its location. For this, the method of using the statistical analysis of geometry by image processing and the slope of force measured from expansion forming was suggested. The new method discovers the adhesion location from the standard deviation of groove height measured before and after expansion of tube and the differentiation of force measured from expansion forming. To prove this method, the area with deviation of groove height above average was discovered, and it was confirmed that from the actual expansion of tube cross-sectional images, the height of some grooves was abnormally shorter due to adhesion. Also, from this method, it was confirmed that the changes in differentiation of force occurring from the expansion of the tube also include the information on adhesion location.

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A new approach in evaluation of thermal contact conductance of tube–fin heat exchanger

Cited by 18 publications

References 8 publications

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

Simulation of Non-Isothermal Turbulent Flows Through Circular Rings of Steel

A new methodology for detecting adhesion location in aluminum tube expansion

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