The Role of Periodic Vortex Shedding in Heat Transfer Enhancement for Transient Pulsatile Flow Inside Wavy Channels
Periodic vortex shedding in pulsating flow inside wavy
channel and the effect it has on heat transfer are studied using the
finite volume method. A sinusoidally-varying component is superimposed
on a uniform flow inside a sinusoidal wavy channel and
the effects on the Nusselt number is analyzed. It was found that a
unique optimum value of the pulsation frequency, represented by the
Strouhal number, exists for Reynolds numbers ranging from 125 to
1000. Results suggest that the gain in heat transfer is related to the
process of vortex formation, movement about the troughs of the wavy
channel, and subsequent ejection/destruction through the converging
section. Heat transfer is the highest when the frequencies of the
pulsation and vortex formation approach being in-phase. Analysis of
Strouhal number effect on Nu over a period of pulsation substantiates
the proposed physical mechanism for enhancement. The effect of
changing the amplitude of pulsation is also presented over a period
of pulsation, showing a monotonic increase in heat transfer with
increasing amplitude. The 60% increase in Nusselt number suggests
that sinusoidal fluid pulsation can an effective method for enhancing
heat transfer in laminar, wavy-channel flows.
[1] L. J. Goldstein and E. M. Sparrow. Heat and mass transfer characteristics
for flow in a corrugated wall channel. Journal of Heat Transfer,
Transactions of the ASME, 99:187-195, 1977.
[2] G. Wang and S. P. Vanka. Convective heat transfer in periodic
wavy passages. International Journal of Heat and Mass Transfer,
38(17):3219-3230, 1995.
[3] Jiehai Zhang, Jaydeep Kundu, and Raj M. Manglik. Effect of fin
waviness and spacing on the lateral vortex structure and laminar heat
transfer in wavy-plate-fin cores. International Journal of Heat and Mass
Transfer, 47:1719-1730, 2004.
[4] David R. Sawyers, Mihir Sen, and Hsueh-Chia Chang. Heat transfer enhancement
in three-dimensional corrugated channel flow. International
Journal of Heat and Mass Transfer, 41:3559-3575, 1998.
[5] H. M. S. Bahaidarah, N. K. Anand, and H. C. Chen. Numerical study of
heat and momentum transfer in channels with wavy walls. Numerische
Heat Transfer, Part A, 47:417-439, 2005.
[6] C. Herman and E. Kang. Comparative evaluation of three heat transfer
enhancement strategies in a grooved channel. Heat and Mass Transfer,
37:563-575, 2001.
[7] Jeffrey S. Perkins, Kyra D. Stephanoff, and Bruce T. Murray. Mixing
enhancement in flow part rectangular cavities as a result of periodically
pulsed fluid motion. IEEE Transactions on Components, Hybrids and
Manufacturing Technology, 12(4):766-771, 1989.
[8] Seo Young Kim, Byung Ha Kang, and Jae Min Hyun. Forced convection
heat transfer from two heated blocks in pulsating channel flow.
International Journal of Heat and Mass Transfer, 41(3):625-634, 1998.
[9] Seo Young Kim, Byung Ha Kang, and Yogesh Jaluria. Thermal
interaction between isolated heated electronic components in pulsating
channel flow. Numerische Heat Transfer, Part A, 34:1-21, 1998.
[10] D. X. Jin, Y. P. Lee, and D.-Y. Lee. Effects of the pulsating flow agitation
on the heat transfer in a triangular grooved channel. International
Journal of Heat and Mass Transfer, 50:30623071, 2007.
[11] Fluent Inc., Lebanon, NH, USA. FLUENT 6.2 User-s Guide, 2005.
[12] Suhas V. Patankar. Numerical Heat Transfer and Fluid Flow. Series in
Computational Methods in Mechanics and Thermal Sciences. McGraw
Hill, New York, 1980.
[13] C. C Wang and C. K. Chen. Forced convection in a wavy-wall channel.
International Journal of Heat and Mass Transfer, 45:2587-2595, 2002.
[1] L. J. Goldstein and E. M. Sparrow. Heat and mass transfer characteristics
for flow in a corrugated wall channel. Journal of Heat Transfer,
Transactions of the ASME, 99:187-195, 1977.
[2] G. Wang and S. P. Vanka. Convective heat transfer in periodic
wavy passages. International Journal of Heat and Mass Transfer,
38(17):3219-3230, 1995.
[3] Jiehai Zhang, Jaydeep Kundu, and Raj M. Manglik. Effect of fin
waviness and spacing on the lateral vortex structure and laminar heat
transfer in wavy-plate-fin cores. International Journal of Heat and Mass
Transfer, 47:1719-1730, 2004.
[4] David R. Sawyers, Mihir Sen, and Hsueh-Chia Chang. Heat transfer enhancement
in three-dimensional corrugated channel flow. International
Journal of Heat and Mass Transfer, 41:3559-3575, 1998.
[5] H. M. S. Bahaidarah, N. K. Anand, and H. C. Chen. Numerical study of
heat and momentum transfer in channels with wavy walls. Numerische
Heat Transfer, Part A, 47:417-439, 2005.
[6] C. Herman and E. Kang. Comparative evaluation of three heat transfer
enhancement strategies in a grooved channel. Heat and Mass Transfer,
37:563-575, 2001.
[7] Jeffrey S. Perkins, Kyra D. Stephanoff, and Bruce T. Murray. Mixing
enhancement in flow part rectangular cavities as a result of periodically
pulsed fluid motion. IEEE Transactions on Components, Hybrids and
Manufacturing Technology, 12(4):766-771, 1989.
[8] Seo Young Kim, Byung Ha Kang, and Jae Min Hyun. Forced convection
heat transfer from two heated blocks in pulsating channel flow.
International Journal of Heat and Mass Transfer, 41(3):625-634, 1998.
[9] Seo Young Kim, Byung Ha Kang, and Yogesh Jaluria. Thermal
interaction between isolated heated electronic components in pulsating
channel flow. Numerische Heat Transfer, Part A, 34:1-21, 1998.
[10] D. X. Jin, Y. P. Lee, and D.-Y. Lee. Effects of the pulsating flow agitation
on the heat transfer in a triangular grooved channel. International
Journal of Heat and Mass Transfer, 50:30623071, 2007.
[11] Fluent Inc., Lebanon, NH, USA. FLUENT 6.2 User-s Guide, 2005.
[12] Suhas V. Patankar. Numerical Heat Transfer and Fluid Flow. Series in
Computational Methods in Mechanics and Thermal Sciences. McGraw
Hill, New York, 1980.
[13] C. C Wang and C. K. Chen. Forced convection in a wavy-wall channel.
International Journal of Heat and Mass Transfer, 45:2587-2595, 2002.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:49428", author = "Esam M. Alawadhi and Raed I. Bourisli", title = "The Role of Periodic Vortex Shedding in Heat Transfer Enhancement for Transient Pulsatile Flow Inside Wavy Channels", abstract = "Periodic vortex shedding in pulsating flow inside wavy
channel and the effect it has on heat transfer are studied using the
finite volume method. A sinusoidally-varying component is superimposed
on a uniform flow inside a sinusoidal wavy channel and
the effects on the Nusselt number is analyzed. It was found that a
unique optimum value of the pulsation frequency, represented by the
Strouhal number, exists for Reynolds numbers ranging from 125 to
1000. Results suggest that the gain in heat transfer is related to the
process of vortex formation, movement about the troughs of the wavy
channel, and subsequent ejection/destruction through the converging
section. Heat transfer is the highest when the frequencies of the
pulsation and vortex formation approach being in-phase. Analysis of
Strouhal number effect on Nu over a period of pulsation substantiates
the proposed physical mechanism for enhancement. The effect of
changing the amplitude of pulsation is also presented over a period
of pulsation, showing a monotonic increase in heat transfer with
increasing amplitude. The 60% increase in Nusselt number suggests
that sinusoidal fluid pulsation can an effective method for enhancing
heat transfer in laminar, wavy-channel flows.", keywords = "Vortex shedding, pulsating flow, wavy channel, CFD.", volume = "2", number = "10", pages = "1093-7", }