On the Use of Wire-Coil Inserts to Augment Tube Heat Transfer

Herring, Neal R.; Heister, Stephen D.

doi:10.1615/jenhheattransf.v16.i1.20

Cited by 10 publications

(2 citation statements)

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“…Thermal stress characteristics for coil inserted tubes were found to be different than those observed without coil inserts. In another study by Herring and Heister, 43 the authors performed experiments and 2-D axisymmetric simulations to analyze flow and heat transfer in laminar flow to assess the performance of wire coil inserted compact heat exchangers. It was concluded that due to the constant onset of the boundary layer, no entry length is required when wire coil inserts were used.…”

Section: Previous Workmentioning

confidence: 99%

Thermal-Hydraulic Performance of an Annular Pipe with Square Wire Coil Inserts Using Computational Fluid Dynamics

Hinge

Patwardhan

2019

Ind. Eng. Chem. Res.

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The development of high-thermal-performance heat exchangers is a demand of the recent era for efficient utilization of energy sources. The present work deals with the computational fluid dynamics (CFD) analysis of flow and heat transfer in an annular pipe with square wire coil inserts in the turbulent flow regime (10500 ⩽ Re ⩽ 35000). A good agreement was observed for the predicted profiles of axial velocity, radial velocity, and turbulent kinetic energy using CFD and particle image velocimetry data. The effect of wire thickness and pitch and Reynolds number (Re) on vortices has been presented using the Q-criterion. The rise in friction factor and Nusselt number with inserts was observed to be 2.22 and 1.41 times higher than that in the plain annular tube. The thermal performance factor was >1 for Re < 15000 indicating that the square wire coil inserts can be used effectively for heat transfer augmentation without pumping power losses.

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Section: Previous Workmentioning

confidence: 99%

Thermal-Hydraulic Performance of an Annular Pipe with Square Wire Coil Inserts Using Computational Fluid Dynamics

Hinge

Patwardhan

2019

Ind. Eng. Chem. Res.

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“…The wire-coil insert is a type of roughness which is wall-attached and its behaviour is more akin to that of special helical ribs, Chen and Zhang [10] and Sethumadhavan and Raja Rao [11]. Herring and Heister [12] carried out an experiment to improve the performance of a compact heat exchanger by using wire-coil inserts in a tube. Khatua et al [13] studied the condensation phenomenon of refrigerant R245fa in a tube fitted with wire-coil inserts.…”

Section: Introductionmentioning

confidence: 99%