The effect of flexible tube vibration on pressure drop and heat transfer in heat exchangers considering viscous dissipation effects

Shokouhmand, Hossein; Sangtarash, Farhad

doi:10.1007/s00231-008-0388-2

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…3. In STHX the vibration of the tubes increases pressure drop [37]. It is evident that the STHX with clamping antivibration baffles has minimum pressure drop compared to the other two heat exchangers.…”

Section: Model Validationmentioning

confidence: 94%

Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles

Naqvi

Wang

2019

Energies

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The most extensively used heat exchanger in numerous research fields and industrial processes is the shell and tube heat exchanger. The selection of the baffle plays a vital role to regulate and increase the thermohydraulic performance and also to decrease fluid-induced vibrations due to shell side flow. 3-D computational fluid dynamics (CFD) and fluid-structure interaction (FSI) have been done to analyze the pressure drop, heat transfer coefficient, vortex shedding, and tube deformation due to induced vibrations among the recently developed clamping antivibration baffles with square twisted tubes, helical baffles with cylindrical tubes, and conventional segmental baffles with cylindrical tubes at different shell side flow rates by using commercial software ANSYS. Complete heat exchangers are modeled for numerical comparison; the thermohydraulic performance of the numerical model shows the suitable agreement by validating it with already published results and Esso method for single segmental baffles. It is then used to compare the performance of the same heat exchangers with CBSTT and HBCT. Thermohydraulic performance of CBSTT-STHX is better than SGCT-STHX. The heat transfer coefficient of heat exchangers with tube-to-baffle-hole clearance is higher and there is a reduction in the pressure drop compared to the results of STHXs without tube-to-baffle-hole clearance. The deformation in the tubes and vortex-induced vibrations are minimum in STHX with CBSTT than in STHXs with HBCT and SGCT.

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Section: Model Validationmentioning

confidence: 94%

Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles

Naqvi

Wang

2019

Energies

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“…Ratio of heat transfer coefficient with and without vibration was found to be slightly higher for shell and tube heat exchanger. Shokouhmand and Sangtarash 18 modeled the effect of placing first tube eccentrically in vibrating tube bundle of shell and tube heat exchanger. An increase of 15% to 20% in convective heat transfer coefficient is observed for flexible tube bundle at low‐frequency vibrations compared to symmetrical rigid tube bundle.…”

Section: Introductionmentioning

confidence: 99%

Influence of transverse vibrations on convective heat transfer in parallel flow tube‐in‐tube heat exchanger

Arasavelli

Konijeti

Budda³

2020

Heat Trans

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Tube‐in‐tube heat exchangers are widely used in food processing industries and wastewater treatment for both heating and cooling. Enhancement techniques namely active, passive, and compound are developed to reduce the thermal resistance in heat exchangers by improving convective heat transfer with or without increase in surface area. The present experimental study is aimed at analyzing the influence of vibrations on the convective heat transfer of a parallel flow tube‐in‐tube heat exchanger. The heat exchanger is placed in horizontal position and is subjected to transverse vibrations under turbulent fluid flow conditions. Experiments were performed at four frequencies (20, 40, 60, and 100 Hz), three amplitudes (1, 2, and 3 m/s2), and three vibration generator positions along its length, in the Reynolds number range of 10 710 to 21 420. An enhancement in Nusselt number is found with vibration than without vibration throughout the entire range of Reynolds numbers. A maximum enhancement of 33% at 40 Hz frequency, 3 m/s2 amplitude, and vibration generator position at three‐fourth of the tube length was observed. Empirical correlations are developed for Nusselt number to determine the heat transfer coefficient with vibration with an error of ±10%.

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Experimental study of heat transfer enhancement due to the surface vibrations in a flexible double pipe heat exchanger

Hosseinian

Isfahani

2017

Heat Mass Transfer

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The effect of flexible tube vibration on pressure drop and heat transfer in heat exchangers considering viscous dissipation effects

Cited by 10 publications

References 3 publications

Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles

Numerical Comparison of Thermohydraulic Performance and Fluid-Induced Vibrations for STHXs with Segmental, Helical, and Novel Clamping Antivibration Baffles

Influence of transverse vibrations on convective heat transfer in parallel flow tube‐in‐tube heat exchanger

Experimental study of heat transfer enhancement due to the surface vibrations in a flexible double pipe heat exchanger

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