Second law analysis and heat transfer in a cross-flow heat exchanger with a new winglet-type vortex generator

Isak Kotcioglu; Sinan Caliskan; Ahmet Cansiz; Senol Baskaya

doi:10.1016/j.energy.2010.05.014

Second law analysis and heat transfer in a cross-flow heat exchanger with a new winglet-type vortex generator

Isak Kotcioglu, Sinan Caliskan^*, Ahmet Cansiz, Senol Baskaya

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

65 Citations (Scopus)

Abstract

In this paper a second law analysis of a cross-flow heat exchanger (HX) is studied in the presence of a balance between the entropy generation due to heat transfer and fluid friction. The entropy generation in a cross-flow HX with a new winglet-type convergent-divergent longitudinal vortex generator (CDLVG) is investigated. Optimization of HX channel geometry and effect of design parameters regarding the overall system performance are presented. For the HX flow lengths and CDLVGs the optimization model was developed on the basis of the entropy generation minimization (EGM). It was found that increasing the cross-flow fluid velocity enhances the heat transfer rate and reduces the heat transfer irreversibility. The test results demonstrate that the CDLVGs are potential candidate procedure to improve the disorderly mixing in channel flows of the cross-flow type HX for large values of the Reynolds number.

Original language	English
Pages (from-to)	3686-3695
Number of pages	10
Journal	Energy
Volume	35
Issue number	9
DOIs	https://doi.org/10.1016/j.energy.2010.05.014
Publication status	Published - 2010
Externally published	Yes

Funding

This project was supported by Atatürk University BAP-1997/37 . The author gratefully acknowledges Professor Teoman Ayhan from the University of Bahrain for valuable suggestions and stimulating discussions on this work.

Funders	Funder number
Atatürk Üniversitesi	BAP-1997/37

Keywords

Cross-flow heat exchanger
Entropy generation
Vortex generators
e{open}-NTU

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10.1016/j.energy.2010.05.014

Cite this

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abstract = "In this paper a second law analysis of a cross-flow heat exchanger (HX) is studied in the presence of a balance between the entropy generation due to heat transfer and fluid friction. The entropy generation in a cross-flow HX with a new winglet-type convergent-divergent longitudinal vortex generator (CDLVG) is investigated. Optimization of HX channel geometry and effect of design parameters regarding the overall system performance are presented. For the HX flow lengths and CDLVGs the optimization model was developed on the basis of the entropy generation minimization (EGM). It was found that increasing the cross-flow fluid velocity enhances the heat transfer rate and reduces the heat transfer irreversibility. The test results demonstrate that the CDLVGs are potential candidate procedure to improve the disorderly mixing in channel flows of the cross-flow type HX for large values of the Reynolds number.",

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AU - Kotcioglu, Isak

AU - Caliskan, Sinan

AU - Cansiz, Ahmet

AU - Baskaya, Senol

PY - 2010

Y1 - 2010

N2 - In this paper a second law analysis of a cross-flow heat exchanger (HX) is studied in the presence of a balance between the entropy generation due to heat transfer and fluid friction. The entropy generation in a cross-flow HX with a new winglet-type convergent-divergent longitudinal vortex generator (CDLVG) is investigated. Optimization of HX channel geometry and effect of design parameters regarding the overall system performance are presented. For the HX flow lengths and CDLVGs the optimization model was developed on the basis of the entropy generation minimization (EGM). It was found that increasing the cross-flow fluid velocity enhances the heat transfer rate and reduces the heat transfer irreversibility. The test results demonstrate that the CDLVGs are potential candidate procedure to improve the disorderly mixing in channel flows of the cross-flow type HX for large values of the Reynolds number.

AB - In this paper a second law analysis of a cross-flow heat exchanger (HX) is studied in the presence of a balance between the entropy generation due to heat transfer and fluid friction. The entropy generation in a cross-flow HX with a new winglet-type convergent-divergent longitudinal vortex generator (CDLVG) is investigated. Optimization of HX channel geometry and effect of design parameters regarding the overall system performance are presented. For the HX flow lengths and CDLVGs the optimization model was developed on the basis of the entropy generation minimization (EGM). It was found that increasing the cross-flow fluid velocity enhances the heat transfer rate and reduces the heat transfer irreversibility. The test results demonstrate that the CDLVGs are potential candidate procedure to improve the disorderly mixing in channel flows of the cross-flow type HX for large values of the Reynolds number.

KW - Cross-flow heat exchanger

KW - Entropy generation

KW - Vortex generators

KW - e{open}-NTU

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EP - 3695

JO - Energy

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Second law analysis and heat transfer in a cross-flow heat exchanger with a new winglet-type vortex generator

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Keywords

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