scholarly journals Experimental and Numerical Study of Heat Transfer Enhancement in a Shell and Tube Heat Exchanger using Helical Coiled Wire Inserts

2018 ◽  
Vol 25 (2) ◽  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Numerical Study ◽  
Transfer Enhancement ◽  
Tube Heat Exchanger ◽  
Shell And Tube

A Numerical Study of Flow and Heat Transfer Enhancement Using an Array of Delta-Winglet Vortex Generators in a Fin-and-Tube Heat Exchanger

2006 ◽  
Vol 129 (9) ◽  
pp. 1156-1167 ◽  
Author(s):  
A. Joardar ◽  
A. M. Jacobi
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Numerical Study ◽  
Flow Behavior ◽  
Vortex Generators ◽  
Computational Domain ◽  
Transfer Enhancement ◽  
Local Flow ◽  
Tube Heat Exchanger

This work is aimed at assessing the potential of winglet-type vortex generator (VG) “arrays” for multirow inline-tube heat exchangers with an emphasis on providing fundamental understanding of the relation between local flow behavior and heat transfer enhancement mechanisms. Three different winglet configurations in common-flow-up arrangement are analyzed in the seven-row compact fin-and-tube heat exchanger: (a) single–VG pair; (b) a 3VG-inline array (alternating tube row); and (c) a 3VG-staggered array. The numerical study involves three-dimensional time-dependent modeling of unsteady laminar flow (330⩽Re⩽850) and conjugate heat transfer in the computational domain, which is set up to model the entire fin length in the air flow direction. It was found that the impingement of winglet redirected flow on the downstream tube is an important heat transfer augmentation mechanism for the common-flow-up arrangement of vortex generators in the inline-tube geometry. At Re=850 with a constant tube-wall temperature, the 3VG-inline-array configuration achieves enhancements up to 32% in total heat flux and 74% in j factor over the baseline case, with an associated pressure-drop increase of about 41%. The numerical results for the integral heat transfer quantities agree well with the available experimental measurements.

Research on Heat Transfer Enhancement of Shutter Baffle Heat Exchanger

2011 ◽  
Vol 236-238 ◽  
pp. 1607-1613 ◽  
Author(s):  
Xin Gu ◽  
Yong Qing Wang ◽  
Qi Wu Dong ◽  
Min Shan Liu
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Cross Flow ◽  
Processing Parameters ◽  
Transfer Enhancement ◽  
Shell Side ◽  
Tube Heat Exchanger ◽  
New Energy ◽  
Shell And Tube

A new concept of “Sideling Flow” in shell side of shell-and-tube heat exchanger is presented, which is relative to the cross flow, longitudinal flow and helical flow in heat exchanger. A type of new energy saving shell-and-tube heat exchanger with sideling flow in shell side, shutter baffle heat exchanger is invented, which exhibits the significant heat transfer enhancement and flow resistance reducement performance. The “Field Synergy Principle” is adopted to analyze the heat transfer enhancement mechanism of sideling flow, it is indicated that the shutter baffle heat exchanger exhibits the perfect cooperativity between velocity field and temperature grads field. Effects of the structure and processing parameters on the fluid flow and heat transfer are also investigated through numerical simulation, both the correlative equations of heat transfer coefficient and pressure drop in shell side are deduced, which provide references for the design and popularization of this new type heat exchanger.

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