The effects of inlet fluid flow nonuniformity on thermal performance and pressure drops in crossflow plate-fin compact heat exchangers

Ranganayakulu, C.; Seetharamu, K. N.; Sreevatsan, K.V.

doi:10.1016/s0017-9310(96)00087-7

Cited by 89 publications

(41 citation statements)

References 14 publications

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“…STD is the standard deviation in the mass flow rate distribution in the tubes and is given by Equation (8). The maximum mass flow rate variation, , is the normalized per cent difference of the maximum and minimum flow rates inside the tubes…”

Section: Correlations Of Flow Maldistributionmentioning

confidence: 99%

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Habib¹,

Ben‐Mansour²,

Said³

et al. 2007

Numerical Methods in Fluids

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SUMMARYThe present paper provides correlations of flow maldistribution parameters in air-cooled heat exchangers. The flow field in the inlet header was obtained through the numerical solution of the governing partial differential equations including the conservation equations of mass and momentum in addition to the equations of the turbulence model. The results were obtained for different number of nozzles of 2-4, different inlet flow velocities of 1-2.5 m/s and different nozzle geometries in addition to incorporation of a second header. The results are presented in terms of mass flow rate distributions in the tubes of the heat exchanger and their standard deviations. The results indicate that the inlet flow velocity has insignificant influence on maldistribution while the nozzle geometry shape has a slight effect. Also, the results indicate that reducing the nozzle diameter results in an increase in the flow maldistribution. A 25% increase is obtained in the standard deviation as a result of decreasing the diameter by 25%. Increasing the number of nozzles has a significant influence on the maldistribution. A reduction of 62.5% in the standard deviation of the mass flow rate inside the tubes is achieved by increasing the number of nozzles from 2 to 4. The results indicate that incorporating a second header results in a significant reduction in the flow maldistribution. A 50% decrease in the standard deviation is achieved as a result of incorporation of a second header of seven holes. It is also found that the hole-diameter distribution at the exit of the second header has a slight influence on the flow maldistribution. Correlations of the flow maldistribution in terms of the investigated parameters are presented.

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Section: Correlations Of Flow Maldistributionmentioning

confidence: 99%

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Habib¹,

Ben‐Mansour²,

Said³

et al. 2007

Numerical Methods in Fluids

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show abstract

“…Velocity distributions were measured on air-cooled head exchanger models and were used to determine the extent to which air flow maldistribution reduced exchanger performance. It was found that maldistribution occurring in well-designed air-cooled heat exchangers reduces the thermal performance by only a few percent.In their earlier work, Ranganayakulu et al [21] investigated the effects of inlet fluid flow non-uniformity on thermal performance and pressure drops in crossflow plate-fin compact heat exchangers. The analysis accounted for the effects of two-dimensional non-uniform inlet fluid flow distribution on both hot and cold fluid sides.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of flow maldistribution in air-cooled heat exchangers

et al. 2009

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“…Ranganayakulau et al [10] analyzed the effect of non-uniform flow distribution of two-dimensional inlet fluids of both the cold and hot sides of the fluid in a cross-flow PFHE using finite element method. They developed mathematical equations for different mal-distribution models for various types of fluid flow, for the effectiveness of the exchanger and its declination due to the flow non-uniformity for all ranges of design and operating conditions.…”

Section: Development Of Experimental Analysis and Results In Platmentioning

confidence: 99%

Review of Experimental Analysis and Comparision of Results With Correlations Developed for Colburn Factor (J) and Friction Factor (F) in Plate Fin Heat Exchangers

2017

IJAERD

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The effects of inlet fluid flow nonuniformity on thermal performance and pressure drops in crossflow plate-fin compact heat exchangers

Cited by 89 publications

References 14 publications

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Evaluation of flow maldistribution in air-cooled heat exchangers

Review of Experimental Analysis and Comparision of Results With Correlations Developed for Colburn Factor (J) and Friction Factor (F) in Plate Fin Heat Exchangers

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