Study of Cross Flow Air-Cooling Process via Water-Cooled Wing-Shaped Tubes in Staggered Arrangement at Different Angles of Attack, Part 2: Heat Transfer Characteristics and Thermal Performance Criteria
An experimental and numerical study has been conducted to clarify heat transfer characteristics and effectiveness of a cross-flow heat exchanger employing staggered wing-shaped tubes at different angels of attack. The water-side Rew and the air-side Rea were at 5 x 102 and at from 1.8 x 103 to 9.7 x 103, respectively. The tubes arrangements were employed with various angles of attack θ1,2,3 from 0° to 330° at the considered Rea range. Correlation of Nu, St, as well as the heat transfer per unit pumping power (ε) in terms of Rea, design parameters for the studied bundle were presented. The temperature fields around the staggered wing-shaped tubes bundle were predicted by using commercial CFD FLUENT 6.3.26 software package. Results indicated that the heat transfer was increased by increasing the angle of attack from 0° to 45°, while the opposite was true for angles of attack from 135° to 180°. The best thermal performance and hence η of studied bundle was occurred at the lowest Rea and/or zero angle of attack. Comparisons between the experimental and numerical results of the present study and those, previously, obtained for similar available studies showed good agreements.
<p>[1] A. Zhukauskas, R. V. Ulinskas, Efficiency parameters of heat transfer in
tube banks, Heat Transfer Engineering, Vol.6, No.1, PP.19-25, 1985.
[2] S. A. Nada, H. El-Batsh, M. Moawed, Heat transfer and fluid flow
around semi-circular tube in cross flow at different orientations,
International Journal of Heat Mass Transfer, Vol. 43, PP. 1157–1169,
2007.
[3] H. Brauer, Compact heat exchangers, J. Chem. Process Eng, pp. 451-
460, 1964.
[4] A. Horvat, M. Leskovar, B. Mavko, Comparison of heat transfer
conditions in tube bundle cross-flow for different tube shapes,
International Journal of Heat and Mass Transfer, Vol. 49, pp. 1027-
1038, 2006.
[5] H. Nishiyama, T. Ota, T. Matsuno, Heat transfer and flow around elliptic
cylinders in tandem arrangement, JASME Int. J., Ser. II, Vol. 31, No. 3,
PP. 410–419, 1988.
[6] D. K. Harris, V. W. Goldschmidt, Measurements of the overall heat
transfer from combustion gases confined within elliptical tube heat
exchangers, Exp. Thermal Fluid Sci., Vol. 26, PP. 33–37, 2002.
[7] T. A. Ibrahim, A. Gomma, Thermal performance criteria of elliptic tube
bundle in cross flow, International Journal of Thermal Sciences, Vol. 48,
PP. 2148-2158, 2009.
[8] E. Z. Ibrahiem, A. O. Elsyed, E. S. Sayed Ahmed, Experimental
investigation of the performance of a cross flow heat exchanger with
bundle of semi-circular tubes, Mansoura Engineering Journal(MEJ),
Vol.28, No.2, 2003.
[9] E. Z. Ibrahiem, A. O. Elsyed, E. S. Sayed Ahmed, Experimental study of
air cooling and dehumidification around an in-line elliptic tubes bank in
cross flow heat exchanger, The International Engineering conference,
Mutah, Jordan, 2003.
[10] M. G. Khan, A. Fartaj, D. S-K. Ting, An experimental characterization
of cross-flow cooling of air via an in-line elliptical tube array,
International Journal of Heat and Fluid Flow, Vol. 25, PP. 636–648,
2004.
[11] N. Mangadoddy, R. Prakash, R. P. Chhabra, R. V. Eswaran, Forced
convection in cross flow of power law fluids over a tube bank, Chemical
Engineering Science, Vol. 59,PP. 2213 – 2222, 2004.
[12] E. Ibrahim, M. Moawed, Forced convection and entropy generation from
elliptic tubes with longitudinal fins, Energy Conversion and
Management, Vol. 50, PP. 1946 – 1954, 2009.
[13] E. S. Sayed Ahmed, O. M. Mesalhy, T. M. Khass, and A. H. Hassan,
Parametric study of air cooling process via water cooled bundle of wingshaped
tubes, EIJST, Vol. 15, No. 3, Sept. 2012.
[14] Y. A. Cengel, Heat transfer a practical approach, McGraw- Hill, New
Jersey, 1998.
[15] FLUENT 6.3.26 User's Guide, FLUENT Inc, 2006.
[16] A. Zukauskas, Heat transfer from tubes in cross flow in Advances in
Heat Transfer, Edited by Hartnett, J. P. and Irvine, T. F. Jr, New York:
Academic Press. Vol. 8, pp. 93-160, 1972.
[17] A. Bergles, A. Blumenkra, J. Taborek, Performance evaluation criteria
for enhanced heat transfer surfaces, 4th Int. Heat Transfer Conference,
Vol. 2, PP. 239–243, 1974.
[18] A. Gomaa, R. LeFeuvre, C. Underwood, T. Bond, Numerical analysis of
developing laminar flow and heat transfer characteristics through
corrugated wall channels, IMechE 6th UK National Conference on Heat
Transfer, UK, pp. 205–214, 1999.
[19] R. Afify, N. Berbish, A. Gomaa, A. Eid, Numerical and experimental
study of turbulent flow and convective heat transfer in a circular tube
with disc-baffles, Engineering Research Journal 96, M37–M61, Faculty
of Eng. at Mattaria, Egypt, 2004.</p>
<p>[1] A. Zhukauskas, R. V. Ulinskas, Efficiency parameters of heat transfer in
tube banks, Heat Transfer Engineering, Vol.6, No.1, PP.19-25, 1985.
[2] S. A. Nada, H. El-Batsh, M. Moawed, Heat transfer and fluid flow
around semi-circular tube in cross flow at different orientations,
International Journal of Heat Mass Transfer, Vol. 43, PP. 1157–1169,
2007.
[3] H. Brauer, Compact heat exchangers, J. Chem. Process Eng, pp. 451-
460, 1964.
[4] A. Horvat, M. Leskovar, B. Mavko, Comparison of heat transfer
conditions in tube bundle cross-flow for different tube shapes,
International Journal of Heat and Mass Transfer, Vol. 49, pp. 1027-
1038, 2006.
[5] H. Nishiyama, T. Ota, T. Matsuno, Heat transfer and flow around elliptic
cylinders in tandem arrangement, JASME Int. J., Ser. II, Vol. 31, No. 3,
PP. 410–419, 1988.
[6] D. K. Harris, V. W. Goldschmidt, Measurements of the overall heat
transfer from combustion gases confined within elliptical tube heat
exchangers, Exp. Thermal Fluid Sci., Vol. 26, PP. 33–37, 2002.
[7] T. A. Ibrahim, A. Gomma, Thermal performance criteria of elliptic tube
bundle in cross flow, International Journal of Thermal Sciences, Vol. 48,
PP. 2148-2158, 2009.
[8] E. Z. Ibrahiem, A. O. Elsyed, E. S. Sayed Ahmed, Experimental
investigation of the performance of a cross flow heat exchanger with
bundle of semi-circular tubes, Mansoura Engineering Journal(MEJ),
Vol.28, No.2, 2003.
[9] E. Z. Ibrahiem, A. O. Elsyed, E. S. Sayed Ahmed, Experimental study of
air cooling and dehumidification around an in-line elliptic tubes bank in
cross flow heat exchanger, The International Engineering conference,
Mutah, Jordan, 2003.
[10] M. G. Khan, A. Fartaj, D. S-K. Ting, An experimental characterization
of cross-flow cooling of air via an in-line elliptical tube array,
International Journal of Heat and Fluid Flow, Vol. 25, PP. 636–648,
2004.
[11] N. Mangadoddy, R. Prakash, R. P. Chhabra, R. V. Eswaran, Forced
convection in cross flow of power law fluids over a tube bank, Chemical
Engineering Science, Vol. 59,PP. 2213 – 2222, 2004.
[12] E. Ibrahim, M. Moawed, Forced convection and entropy generation from
elliptic tubes with longitudinal fins, Energy Conversion and
Management, Vol. 50, PP. 1946 – 1954, 2009.
[13] E. S. Sayed Ahmed, O. M. Mesalhy, T. M. Khass, and A. H. Hassan,
Parametric study of air cooling process via water cooled bundle of wingshaped
tubes, EIJST, Vol. 15, No. 3, Sept. 2012.
[14] Y. A. Cengel, Heat transfer a practical approach, McGraw- Hill, New
Jersey, 1998.
[15] FLUENT 6.3.26 User's Guide, FLUENT Inc, 2006.
[16] A. Zukauskas, Heat transfer from tubes in cross flow in Advances in
Heat Transfer, Edited by Hartnett, J. P. and Irvine, T. F. Jr, New York:
Academic Press. Vol. 8, pp. 93-160, 1972.
[17] A. Bergles, A. Blumenkra, J. Taborek, Performance evaluation criteria
for enhanced heat transfer surfaces, 4th Int. Heat Transfer Conference,
Vol. 2, PP. 239–243, 1974.
[18] A. Gomaa, R. LeFeuvre, C. Underwood, T. Bond, Numerical analysis of
developing laminar flow and heat transfer characteristics through
corrugated wall channels, IMechE 6th UK National Conference on Heat
Transfer, UK, pp. 205–214, 1999.
[19] R. Afify, N. Berbish, A. Gomaa, A. Eid, Numerical and experimental
study of turbulent flow and convective heat transfer in a circular tube
with disc-baffles, Engineering Research Journal 96, M37–M61, Faculty
of Eng. at Mattaria, Egypt, 2004.</p>
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:52792", author = "Sayed Ahmed E. Sayed Ahmed and Emad Z. Ibrahiem and Osama M. Mesalhy and Mohamed A. Abdelatief", title = "Study of Cross Flow Air-Cooling Process via Water-Cooled Wing-Shaped Tubes in Staggered Arrangement at Different Angles of Attack, Part 2: Heat Transfer Characteristics and Thermal Performance Criteria", abstract = "An experimental and numerical study has been conducted to clarify heat transfer characteristics and effectiveness of a cross-flow heat exchanger employing staggered wing-shaped tubes at different angels of attack. The water-side Rew and the air-side Rea were at 5 x 102 and at from 1.8 x 103 to 9.7 x 103, respectively. The tubes arrangements were employed with various angles of attack θ1,2,3 from 0° to 330° at the considered Rea range. Correlation of Nu, St, as well as the heat transfer per unit pumping power (ε) in terms of Rea, design parameters for the studied bundle were presented. The temperature fields around the staggered wing-shaped tubes bundle were predicted by using commercial CFD FLUENT 6.3.26 software package. Results indicated that the heat transfer was increased by increasing the angle of attack from 0° to 45°, while the opposite was true for angles of attack from 135° to 180°. The best thermal performance and hence η of studied bundle was occurred at the lowest Rea and/or zero angle of attack. Comparisons between the experimental and numerical results of the present study and those, previously, obtained for similar available studies showed good agreements.
", keywords = "Wing-shaped tubes, Cross-flow cooling, Staggered
arrangement, and CFD.", volume = "7", number = "6", pages = "1045-14", }
