THE EFFECT OF FLEXIBLE TUBE VIBRATION ON PRESSURE DROP AND HEAT TRANSFER COEFFICIENT IN HEAT EXCHANGERS WITH TEMPERATURE DEPENDANT VISCOSITY IN CROSS FLOW

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SHOKOUHMAND H.; SANGTARASH F.; ESFAHANIAN V.

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Journal: Year:2007 | Volume:40 | Issue:6 (100) Page(s): 839-851

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Title

THE EFFECT OF FLEXIBLE TUBE VIBRATION ON PRESSURE DROP AND HEAT TRANSFER COEFFICIENT IN HEAT EXCHANGERS WITH TEMPERATURE DEPENDANT VISCOSITY IN CROSS FLOW

Author(s)

SHOKOUHMAND H. | SANGTARASH F. | ESFAHANIAN V. | Issue Writer Certificate

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Abstract

In general, vibrations have been found to induce tube wear and failure in metal tubes. Because of this, vibrations in tube bundles are minimized in well designed heat exchangers. Recently tube bundles made of flexible material such as Teflon have been used in heat exchangers operating in corrosive environments like strong acids in high temperature and pressure conditions. However, another consequence of tube vibrations is higher heat transfer rate caused by increased fluid mixing.Thus, the use of heat exchangers made of Teflon and other plastics is becoming common practice for many industrial processes.The pressure drop and heat transfer coefficient in tube bundle of shell and tube heat exchangers are investigated considering viscous dissipation effects. The governing equations are solved numerically. Because of time dependent viscosity the equations should be solved simultaneously. The flexible tubes vibration is modelled in a quasi static method by taking the first tube of the row to be in 30 asymmetric positions with respect to the rest of the tubes which are assumed to be fixed and time averaging the steady state solutions corresponding to each one of these positions. The numerical method used for this problem is a finite deference method, upwind method, and applied for a group of five tubes in a row and can be generalized to bundles of more than five tubes in a square or triangular arrangement. It is observed that the eccentricity of the first tube significantly affects the velocity and temperature fields. The results show that the eccentricity of the first tube increases pressure drop and heat transfer coefficients significantly comparing to the case of rigid tube bundles, symmetrically placed. In addition, it has been shown that in spite of unfavorable effect of viscous dissipation on heat transfer coefficient, the overall heat transfer rate increases because of favourite effect of flexible tube vibrations. The results obtained from our numerical method have a good agreement with the available experimental data of constant viscosity for flexible tube heat exchangers and it shows that this numerical method is reliable despite its relative simplicity. Finally, because of higher heat transfer coefficient and lighter material and being strong enough to withstand moderately high temperature and pressure particularly in corrosive environment heat exchangers with this kind of material can be a good alternative for solid tube heat exchangers.

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APA: Copy

SHOKOUHMAND, H., SANGTARASH, F., & ESFAHANIAN, V.. (2007). THE EFFECT OF FLEXIBLE TUBE VIBRATION ON PRESSURE DROP AND HEAT TRANSFER COEFFICIENT IN HEAT EXCHANGERS WITH TEMPERATURE DEPENDANT VISCOSITY IN CROSS FLOW. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 40(6 (100)), 839-851. SID. https://sid.ir/paper/14369/en

Vancouver: Copy

SHOKOUHMAND H., SANGTARASH F., ESFAHANIAN V.. THE EFFECT OF FLEXIBLE TUBE VIBRATION ON PRESSURE DROP AND HEAT TRANSFER COEFFICIENT IN HEAT EXCHANGERS WITH TEMPERATURE DEPENDANT VISCOSITY IN CROSS FLOW. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2007;40(6 (100)):839-851. Available from: https://sid.ir/paper/14369/en

IEEE: Copy

H. SHOKOUHMAND, F. SANGTARASH, and V. ESFAHANIAN, “THE EFFECT OF FLEXIBLE TUBE VIBRATION ON PRESSURE DROP AND HEAT TRANSFER COEFFICIENT IN HEAT EXCHANGERS WITH TEMPERATURE DEPENDANT VISCOSITY IN CROSS FLOW,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 40, no. 6 (100), pp. 839–851, 2007, [Online]. Available: https://sid.ir/paper/14369/en

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