Heat Transfer Augmentation

Most compact heat exchangers operate in the low Reynolds number laminar to transitional regime. The research has focused on  the use of enhanced surfaces to augment heat transfer through unsteady mechanisms. A distinguishing feature  has been the emphasis on the detailed analysis of fundamental flow physics in relation to heat transfer augmentation.

Publications

Journal

• Liu, G., Ye, X., Tafti, D. K., Zhu, D. and Cao Z. “Analysis of multiphase heat transfer of TA2/Q235B clad plate subjected to impinging liquid jet cooling,” Heat Transfer Eng., July 2020. https://doi.org/10.1080/01457632.2020.1800273
• Seibert, M. L., Blackwell, N. E. and Tafti, D. K., Effect of Pin Tip Dual Clearance on Flow and Heat Transfer at Low Reynolds Numbers, J. Heat Transfer 136(7), pp. 071901, 2014.  https://doi.org/10.1115/1.4027184.
• N. Krishnamurthy, Tafti, D. K., Viswanathan, A., Modeling of Soot Deposition in Wavy-Fin Exhaust Gas Recirculator Coolers, Int. J. Heat Mass Transfer 54, pp. 1671-1681, 2011.
• Selvarasu, N. K. C., Tafti, D. K. and Blackwell, N., Effect of Pin Density and Heat-Mass Transfer and Fluid Flow at low Reynolds numbers in mini-channels, ASME J. Heat Transfer, 132(6), April 2010.
• Elyyan, M. and Tafti, D. K., A Novel Split-Dimple Interrupted Fin Configuration for Heat Transfer Augmentation, Int. J. Heat Mass Transfer, 52, 1561-1572, 2009.
• Elyyan, M. and Tafti, D. K., Flow and Heat Transfer Characteristics of Dimpled Multilouvered Fins, J. Enhanced Heat Transfer, 16(1), 1-18, 2009.
• Li S.-M. and Tafti D.K., Near-Critical CO2 Liquid-Vapor Flow in a Sub-Microchannel. Part 2: Flow Regimes, J. Multiphase Flow 35(12), pp. 1130-1137, 2009
• Srinivas, S., Tafti, D. K., Rozati, A., Blackwell, N. E., Heat-Mass Transfer and Friction Characteristics of Profiled Pins at Low Reynolds Numbers, Numerical Heat Transfer, Part A, 54(2), pp. 130-150, 2008.
• Elyyan, M. A., Rozati, A. and Tafti, D. K., Investigation of Dimpled Fins for Heat Transfer Enhancement in Compact Heat Exchangers, Int. J. Heat Mass Transfer 51, pp. 2950-2966, 2008.
• Rozati, A. and Tafti, D. K., Blackwell, N. E., Effect of Pin Tip Clearance on Flow and Heat Transfer at Low Reynolds Numbers, ASME J. Heat Transfer 130, 071704(1-10), July 2008.
• Elyyan, M. A. and Tafti, D. K., LES Investigation of Flow and Heat Transfer in a Channel with Dimples and Protrusions, ASME J. Turbomachinery 130(4), 041016(1-9), 2008.
• Zhang, X. and Tafti D. K., Flow Efficiency in Multilouvered Fins, Int. J. Heat Mass Transfer, Vol. 46(10), pp. 1737-1750, 2003.
• Tafti D. K. and Cui, J., Fin-Tube Junction Effects on Flow and Heat Transfer in Flat Tube Corrugated Multilouvered Heat Exchangers, Int. J. Heat Mass Transfer, Vol. 46(11), pp. 2027-2038, 2003
• Cui, J. and Tafti D. K., Computations of Flow and Heat Transfer in a Three-Dimensional Multilouvered Geometry, Int. J. Heat Mass Transfer, Vol. 45(25), pp. 5007-5023, 2002.
• Tafti D. K., Zhang, X., Geometry Effects on Flow Transition in Multilouvered Fins – Onset, propagation, and Characteristic Frequencies, Int. J. Heat Mass Transfer, Vol. 44/22, pp. 4195-4210, 2001.
• Zhang, X. and Tafti D. K., Classification and Effects of Thermal Wakes in Multilouvered Fins, Int. J. Heat Mass Transfer, Vol. 44/13, pp. 2461-2473, 2001.
• Tafti D.K., Wang G. and Lin W., Flow Transition in a Multilouvered Fin Array, Int. J. Heat Mass Transfer, vol. 43, No. 6, pp. 901-919, 2000.
• DeJong N.C., Zhang L.W., Jacobi A.M., Balachandar S. and Tafti D.K., A Combined Experimental and Numerical Study of Flow and Heat Transfer in Offset Strip-Fin Heat Exchangers, J. HeatTransfer, Vol. 120, pp. 690-698, Aug. 1998.
• Zhang, L, Balachandar S. and Tafti D. K., Effects of Intrinsic Three Dimensionality on Heat Transfer and Friction Loss in a Periodic Array of Parallel Plates, Numerical Heat Transfer, Part A, 31, pp. 327-353, 1997.
• Zhang, L., Balachandar S., Tafti D. K. and Najjar, F. Heat Transfer Enhancement Mechanisms in InLine and Staggered Parallel Plate Fin Heat Exchangers, Int. J. of Heat Mass Transfer, vol. 40, No. 10, pp. 2307-2325, 1997.
• Zhang, L., Tafti D. K., Najjar, F., and Balachandar S., Computations of Flow and Heat Transfer in Parallel-Plate Fin Heat Exchangers on the CM-5; Effects of Flow Unsteadiness and Three-Dimensionality, Int. J. of Heat Mass Transfer, vol. 40, No. 6, pp. 1325-1341, 1997.

Conference

• Amritkar, A. and Tafti D. K., Relative Performance of some Novel Heat Transfer Augmentation Surfaces, Proceedings of the 20th National and 9th International ISHMT-ASME Heat and Mass Transfer Conference , January 4-6, 2010, Mumbai, India.
• Selvarasu, N. K. C. and Tafti, D. K., Blackwell, N., Optimization of Pin Fin Density at Low Reynolds Numbers in Minichannels, Seventh International Conference on Enhanced, Compact and Ultra-Compact Heat Exchangers: From Microscale Phenomena to Industrial Applications, Costa Rica, Sep. 2009.
• Krishnamurthy, N., Tafti D. K., Viswanathan, A. K., Modeling of Air-Side Fouling in Exhaust Gas Recirculators – Turbulent Channel Flow, Seventh International Conference on Enhanced, Compact and Ultra-Compact Heat Exchangers: From Microscale Phenomena to Industrial Applications, Costa Rica, Sep. 2009.
• Elyyan, M. and Tafti, D. K., Investigation of a Split Dimple Fin Geometry for Heat Transfer Augmentation, Paper No. 56117, 2008 ASME Summer Heat Transfer Conference, Aug. 10-14, Jacksonville, Florida.
• Elyyan, M., Tafti D. K., Flow and Heat Transfer Characteristics of Dimpled Multilouvered Fins, Paper No: US-25, 19th National & 8th ISHMT-ASME Heat and Mass Transfer Conference, JNTU Hyderabad, India, January 3 - 5, 2008.
• Rozati, A., Tafti, D.K., Blackwell, N.E., Thermal Performance of Pin Fins at Low Reynolds Numbers in Mini-micro Channels, Proceedings of HT2007, 2007 ASME-JSME Thermal Engineering Summer Heat Transfer Conference, July 8-12, 2007, Vancouver, British Columbia, Canada, ASME paper No. HT2007-32158, 2007.
• Elyyan, M. A. and Tafti, D. K., LES Investigation of Flow and Heat Transfer in a Channel with Dimples and Protrusions”. ASME Paper No. GT2007-27811, Proceedings ASME Turbo Expo 2007: Power for Land, Sea and Air, May 14-17, 2007, Montreal, Canada
• Elyyan, D. K. Tafti, Flow Structure in Channels with dimples and protrusions at high Reynolds numbers, ASME Joint US-European Fluids Engineering Summer Meeting, July 17-20, 2006, Miami, Florida, USA.
• Tafti D. K., Computational Insights into Air-Side Flow and Heat Transfer in Compact Heat Exchangers, HT2005-72846, Proceedings of HT2005, 2005 ASME Summer Heat Transfer Conference, July 17-22, 2005, San Francisco, California, USA.
• Patrick, W. and Tafti D. K. Computations of Flow Structure and Heat Transfer in a Dimpled Channel at Low to Moderate Reynolds number, HT-FED2004-56171, 2004 ASME Heat Transfer/Fluids Engineering Summer Conference, July 11-15, Charlotte.
• Guo, D. H. and Tafti, D. K., Effect of Inlet Flow Angle on Performance of Multilouvered Fin Heat Exchangers, Paper No. IMECE2003-41225, 2003 ASME International Mechanical Engineering Congress and R&D EXPO, Washington, D. C., USA, November 15 -21, 2003.
• Guo, D. H. and Tafti D. K., Effect of Louver Angle in Multilouvered Fins at Low Reynolds Numbers, Paper No. HTD2003-40035, Proceedings of HTD2003: ASME Summer Heat Transfer Conference, July 21-23, Las Vegas, Nevada, 2003.
• Tafti D. K. and Cui, J., Advances in the Computation of Air-side Heat Transfer in Compact Heat Exchangers, Forum on Parallel Computing in Heat Transfer, Proceedings of 2002 ASME International Mechanical Engineering Congress and Exposition, Nov. 17-22, 2002, New Orleans, Louisiana.
• Zhang, X. and Tafti, D. K., Effect of Fin Thickness on Flow and Heat Transfer in Multilouvered Fins, Proceedings of 2002 ASME International Mechanical Engineering Congress and Exposition, Nov. 17-22, 2002, New Orleans, Louisiana.
• Tafti D. K., Zhang, X., Huang, W. and Wang, G., Large-Eddy Simulations of Flow and Heat transfer in Complex Three-Dimensional Multilouvered Fins, 2000 ASME Fluids Engineering Division Summer Meeting, FEDSM2000-11325, FED Vol. 251, June 11-15, 2000, Boston Massachusetts.
• Zhang X. and Tafti D. K., Effect of Fin Pitch on Flow and Heat Transfer in Multilouvered Fins, 4^th ISHMT/ASME Heat and Mass Transfer Conference, Pune, India, 12-15 January 2000.
• Tafti D. K. and Zhang, L, A Time-Dependent Calculation Procedure for Flow and Heat Transfer in a Periodic Array of Louvered Fins, Proceedings of the Third ISHMT-ASME Heat and Mass Transfer Conference, IIT- Kanpur, paper no. HMT-97-097, pp. 721-728, Dec. 27-31, 1997.
• Zhang, L., Balachandar, S., Najjar, F. M. and Tafti, D. K., A Numerical Study of Heat Transfer Mechanisms in Parallel-Plate Fin Heat Exchangers, International Conference on Advances in Mechanical Engineering, Bangalore, India, December 1995.