FLOW, HEAT AND PRESSURE DROP COMPUTATION FOR TUBE BUNDLES IN CROSS FLOW BY BOUNDARY-DOMAIN INTEGRAL METHOD

1992 ◽  
Author(s):  
P. Skerget ◽  
I. Zagar ◽  
M. Hribersek
Keyword(s):  
Pressure Drop ◽  
Integral Method ◽  
Cross Flow ◽  
Domain Integral ◽  
Tube Bundles ◽  
Flow Heat

Analysis of Flow Mal-Distribution in a Cross-Flow Heat Exchanger

2014 ◽  
Vol 592-594 ◽  
pp. 1428-1432 ◽  
Author(s):  
Krishna P. Mohan ◽  
Shekar M. Santosh ◽  
M. Ramakanth ◽  
M.R. Thansekhar ◽  
M. Venkatesan
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Cross Flow ◽  
Flow Distribution ◽  
Ansys Fluent ◽  
Commercial Code ◽  
Uniform Flow Distribution ◽  
Flow Heat ◽  
Channel Assembly ◽  
Uniform Fluid

Flow mal-distribution is defined as the non-uniform fluid flow distribution among the parallel channels having a common header. Flow mal-distribution is present in every header channel assembly. This mal-distribution has a significant effect on the performance of the heat exchanger by increasing the pressure drop and affecting the heat transfer characteristics. However, in designing a heat exchanger, a uniform flow distribution in each channel is assumed. The present work attempts to reduce the flow mal-distribution in a cross flow heat exchanger. A numerical analysis is done using a commercial code ANSYS FLUENT 3D and the results are validated experimentally. A parametric study is done by changing the size of the channels within the heat exchanger so as to reduce the flow mal-distribution. The effect of varying channel size on flow mal-distribution and pressure drop across the heat exchanger is studied and a geometry with reduced flow mal-distribution is found.

Air-Side Heat Transfer and Pressure Drop Characteristics of Multi-Louver Fin and Flat Tube Heat Exchangers

2000 ◽  
Author(s):  
Man-Hoe Kim ◽  
Clark W. Bullard
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Exchangers ◽  
Water Flow Rate ◽  
Cross Flow ◽  
Reynolds Numbers ◽  
Flat Tube ◽  
Louvered Fin ◽  
Flow Heat ◽  
Fanning Friction Factor

Abstract An experimental study on the air-side heat transfer and pressure drop characteristics for multi-louvered fin and flat tube heat exchangers has been performed. For 45 heat exchangers with different louver angles (15–29°), fin pitches (1.0, 1.2, 1.4 mm) and flow depths (16, 20, 24 mm), a series of tests were conducted for the air-side Reynolds numbers of 100–600, at a constant tube-side water flow rate of 0.32 m3/h. The inlet temperatures of the air and water for heat exchangers were 21°C and 45°C, respectively. The air-side thermal performance data were analyzed using effectiveness-NTU method for cross-flow heat exchanger with both fluids unmixed. The heat transfer coefficient and pressure drop data for heat exchangers with different geometrical configurations were reported in terms of Colburn j-factor and Fanning friction factor f, as functions of Reynolds number based on louver pitch. Correlations for j and f factors are developed and compared to other correlations.

scholarly journals Investigation of effect on cross-flow heat exchanger with air flow non-uniformity under low Reynolds number

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401770808 ◽  
Author(s):  
Kai Shen ◽  
Zhendong Zhang ◽  
Ziqing Zhang ◽  
Youwen Yang
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Low Reynolds Number ◽  
Air Flow ◽  
Cross Flow ◽  
Calculation Model ◽  
Flow Heat ◽  
Air Flows ◽  
Low Reynolds

In this study, the theoretical and experimental study of a cross-flow heat exchanger is carried out based on the theory of porous media under low Reynolds number. The accuracy of the mathematical calculation model is verified by experiments. Pressure drop in air side and efficiency of heat exchanger are analyzed with mathematical models of various non-uniform air flows under low Reynolds number. The responses are found influences of air flow non-uniformity on pressure drop and efficiency of heat exchanger have certain rules. The difference in pressure drops between non-uniform air flows and evenly distributed air flows is linearly related to variance [Formula: see text] of non-uniformity. And the increasing rate of resistance energy consumption difference between non-uniform air flows and evenly distributed air flows is approximately linearly related to the relatively non-uniform coefficient squared [Formula: see text] of non-uniformity. The descent range of heat transfer efficiency has exponential relation to the relatively non-uniform coefficient [Formula: see text].

An Experimental Study of the Mean Flow and Turbulence Structure Of Cross-Flow Over Tube Bundles

1996 ◽  
Vol 210 (4) ◽  
pp. 317-331 ◽  
Author(s):  
S Balabani ◽  
M Yianneskis
Keyword(s):  
Pressure Drop ◽  
Laser Doppler Anemometry ◽  
Cross Flow ◽  
Turbulence Structure ◽  
Mean Flow ◽  
Time Resolved ◽  
Numerical Predictions ◽  
Dissipation Rates ◽  
Tube Bundles ◽  
The Mean

The velocity characteristics of cross-flow over tube bundles were investigated in a water tunnel. Three tube arrays with a transverse pitch ratio of 3.6 were studied: an in-line and two staggered arrays with longitudinal pitch ratios of 2.1, 1.6 and 2.1 respectively. The mean velocities, turbulence levels, spectra, time and length scales and dissipation rates were determined from ensemble-averaged and time-resolved laser Doppler anemometry (LDA) measurements. The pressure drop across the bundles was also measured. The staggered arrays were found to generate higher levels of turbulence and a higher pressure drop. Turbulence kinetic energy reaches a maximum downstream of the second row in staggered arrays. The wake regions in both geometries are anisotropic with transverse r.m.s. velocities being higher than axial ones. Increasing the longitudinal spacing in the staggered configuration results in lower r.m.s. levels in the wakes and alteration of the recirculation characteristics. A discrete periodicity with a Strouhal number of 0.26 was identified in the 3.6 times 1.6 staggered array which is associated with vortex shedding. Turbulence scales and dissipation rates were estimated and compared with numerical predictions.

scholarly journals Heat Transfer and Pressure Drop of Cross-flow Heat Exchanger on Modules Variation

2013 ◽  
Vol 22 (2) ◽  
pp. 120-127
Author(s):  
Jong-Min Kim ◽  
Jinsu Kim ◽  
Byeonghun Yu ◽  
Sungmin Kum ◽  
Chang-Eon Lee ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Cross Flow ◽  
Flow Heat
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