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Research Papers: Heat Exchangers

Computational Fluid Dynamics and Heat Transfer Analysis for a Novel Heat Exchanger

[+] Author and Article Information
Haolin Ma

Department of Mechanical Engineering and Mechanics,
Lehigh University,
Packard Lab #356,
Bethlehem, PA 18015
e-mail: ham310@lehigh.edu

Dennis E. Oztekin

Mem. ASME
Department of Mechanical Engineering and Mechanics,
Lehigh University,
Packard Lab #356,
Bethlehem, PA 18015
e-mail: deo308@lehigh.edu

Seyfettin Bayraktar

Department of Naval Architecture
and Marine Engineering,
Yildiz Technical University,
Besiktas-Istanbul 34349, Turkey
e-mail: sbay@yildiz.edu.tr

Sedat Yayla

Department of Mechanical Engineering,
Yuzuncu Yil University,
Van 65080,Turkey
e-mail: syayla@yyu.edu.tr

Alparslan Oztekin

Mem. ASME
Department of Mechanical Engineering and Mechanics,
Lehigh University,
Packard Lab #356,
Bethlehem, PA 18015
e-mail: alo2@lehigh.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 19, 2014; final manuscript received February 1, 2015; published online March 3, 2015. Assoc. Editor: Danesh / D. K. Tafti.

J. Heat Transfer 137(5), 051801 (May 01, 2015) (11 pages) Paper No: HT-14-1418; doi: 10.1115/1.4029764 History: Received June 19, 2014; Revised February 01, 2015; Online March 03, 2015

Computational fluid dynamics (CFD) and heat transfer simulations are conducted for a novel heat exchanger. The heat exchanger consists of semi-circle cross-sectioned tubes that create narrow slots oriented in the streamwise direction. Numerical simulations are conducted for Reynolds numbers (Re) ranging from 700 to 30,000. Three-dimensional turbulent flows and heat transfer characteristics in the tube bank region are modeled by the k-ε Reynolds-averaged Navier–Stokes (RANS) method. The flow structure predicted by the two-dimensional and three-dimensional simulations is compared against that observed by the particle image velocimetry (PIV) for Re of 1500 and 4000. The adequate agreement between the predicted and observed flow characteristics validates the numerical method and the turbulent model employed here. The three-dimensional and the two-dimensional steady flow simulations are compared to determine the effects of the wall on the flow structure. The wall influences the spatial structure of the vortices formed in the wake of the tubes and near the exit of the slots. The heat transfer coefficient of the slotted tubes improved by more than 40% compare to the traditional nonslotted tubes.

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References

Choi, S. U., and Eastman, J. A., 1995, “Enhancing Thermal Conductivity of Fluids With Nanoparticles,” Argonne National Laboratory, Report No. ANL/MSD/CP–84938; CONF-951135–29.
Eastman, J. A., Choi, S. U. S., Li, S., Yu, W., and Thompson, L. J., 2001, “Anomalously Increased Effective Thermal Conductivities of Ethylene Glycol-Based Nanofluids Containing Copper Nanoparticles,” Appl. Phys. Lett., 78(6), pp. 718–720. [CrossRef]
Timofeeva, E. V., Routbort, J. L., and Singh, D., 2009, “Particle Shape Effects on Thermophysical Properties of Alumina Nanofluids,” J. Appl. Phys., 106(1), p. 014304. [CrossRef]
Yang, Y., Oztekin, A., Neti, S., and Mohapatra, S., 2012, “Particle Agglomeration and Properties of Nanofluids,” J. Nanopart. Res., 14(5), p. 852. [CrossRef]
Jang, J. Y., and Chen, L. K., 1997, “Numerical Analysis of Heat Transfer and Fluid Flow in a Three-Dimensional Wavy-Fin and Tube Heat Exchanger,” Int. J. Heat Mass Transfer, 40(16), pp. 3981–3990. [CrossRef]
Nuntaphan, A., Kiatsiriroat, T., and Wang, C. C., 2005, “Air Side Performance at Low Reynolds Number of Cross-Flow Heat Exchanger Using Crimped Spiral Fins,” Int. Commun. Heat Mass Transfer, 32(1–2), pp. 151–165. [CrossRef]
Khan, W. A., Culham, J. R., and Yovanovich, M. M., 2006, “Convection Heat Transfer From Tube Banks in Crossflow: Analytical Approach,” Int. J. Heat Mass Transfer,49( 25–26), pp. 4831–4838. [CrossRef]
Khan, W. A., Culham, R. J., and Yovanovich, M. M., 2007, “Optimal Design of Tube Banks in Cross Flow Using Entropy Generation Minimization Method,” J. Thermophys. Heat Transfer, 21(2), pp. 372–378. [CrossRef]
Ravagnani, M. A. S. S., Silva, A. P., Biscaia, E. C., and Caballero, J. A., 2009, “Optimal Design of Shell-and-Tube Heat Exchangers Using Particle Swarm Optimization,” Industrial & Engineering Chemistry Research, 48(6), pp. 2927–2935. [CrossRef]
Matos, R. S., Vargas, J., Laursen, T. A., and Saboya, F., 2001, “Optimization Study and Heat Transfer Comparison of Staggered Circular and Elliptic Tubes in Forced Convection,” Int. J. Heat Mass Transfer, 44(20), pp. 3953–3961. [CrossRef]
Unuvar, A., and Kargici, S., 2004, “An Approach for the Optimum Design of Heat Exchangers,” Int. J. Energy Res., 28(15), pp. 1379–1392. [CrossRef]
Hilbert, R., Janiga, G., Baron, R., and Thévenin, D., 2006, “Multi-Objective Shape Optimization of a Heat Exchanger Using Parallel Genetic Algorithms,” Int. J. Heat Mass Transfer, 49(15–16), pp. 2567–2577. [CrossRef]
Stanescu, G., Fowler, A. J., and Bejan, A., 1996, “The Optimal Spacing of Cylinders in Free-Stream Cross-Flow Forced Convection,” Int. J. Heat Mass Transfer, 39(2), pp. 311–317. [CrossRef]
Leu, J.-S., Wu, Y.-H., and Jang, J.-Y., 2004, “Heat Transfer and Fluid Flow Analysis in Plate-Fin and Tube Heat Exchangers With a Pair of Block Shape Vortex Generators,” Int. J. Heat Mass Transfer, 47(19–20), pp. 4327–4338. [CrossRef]
Torii, K., Kwak, K. M., and Nishino, K., 2002, “Heat Transfer Enhancement Accompanying Pressure-Loss Reduction With Winglet-Type Vortex Generators for Fin-Tube Heat Exchangers,” Int. J. Heat Mass Transfer, 45(18), pp. 3795–3801. [CrossRef]
Hwang, S. W., Kim, D. H., Min, J. K., and Jeong, J. H., 2012, “CFD Analysis of Fin Tube Heat Exchanger With a Pair of Delta Winglet Vortex Generators,” J. Mech. Sci. Technol., 26(9), pp. 2949–2958. [CrossRef]
Popiel, C. O., Robinson, D. I., and Turner, J. T., 1993, “Vortex Shedding From a Circular Cylinder With a Slit and Concave Rear Surface,” Appl. Scientific Res., 51(1), pp. 209–215. [CrossRef]
Yayla, S., 2013, “Flow Characteristic of Staggered Multiple Slotted-Tubes in the Passage of a Fin Tube Heat Exchanger,” Strojniski vestnik–J. Mech. Eng., 59(7–8), pp. 462–472. [CrossRef]
Reynolds, O., 1895, “On the Dynamical Theory of Incompressible Viscous Fluids and the Determination of the Criterion,” Philos. Trans. R. Soc. London, Ser. A, 186, pp. 123–164. [CrossRef]
Shih, T. H., Liou, W. W., Shabbir, A., Yang, Z., and Zhu, J., 1995, “A New k-ϵ Eddy Viscosity Model for High Reynolds Number Turbulent Flows,” Comput. Fluids, 24(3), pp. 227–238. [CrossRef]
Taylor, G. I., 1938, “Production and Dissipation of Vorticity in a Turbulent Fluid,” Proc. Royal Soc. London. A, Math. Phys. Sci., 164(916), pp. 15–23. [CrossRef]
Grimison, E. D., 1937, “Correlation and Utilization of New Data on Flow Resistance and Heat Transfer for Cross Flow of Gases Over Tube Banks,” Trans. ASME, 59(7), pp. 583–594.
Žukauskas, A., 1972, “Heat Transfer From Tubes in Crossflow,” Adv. Heat Transfer, 8, pp. 93–160. [CrossRef]
Žukauskas, A., and Ulinskas, R., 1988, Heat Transfer in Tube Banks in Crossflow, Hemisphere, New York.
Incropera, F. P., and DeWitt, D. P., 2011, Fundamentals of Heat and Mass Transfer, 7th ed., Wiley, Hoboken, NJ.
ANSYSFluent 14.0 User’s Guide, Nov. 2011.
Webb, R. L., and Eckert, E. R. G., 1972, “Application of Rough Surfaces to Heat Exchanger Design,” Int. J. Heat Mass Transfer, 15(9), pp. 1647–1658. [CrossRef]
Moon, S. W., and Lau, S. C., 2003, “Heat Transfer Between Blockages With Holes in a Rectangular Channel,” ASME J. Heat Transfer, 125(4), pp. 587–594. [CrossRef]

Figures

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Fig. 1

Schematic of the test section of the slotted tube bank. It consists of seven columns and seven rows in a staggered arrangement.

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Fig. 2

Three-dimensional computational domain. It includes a tube bank of seven rows and five columns in a staggered arrangement. x is measured from the inlet, y is measured from the mid-plane, and z is measured from the front plate.

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Fig. 3

Mesh structure for: (a) a full computational domain, (b) near the tube bank, (c) at the interface, and (d) in the exit region. The mesh includes 4 × 106-elements. The flow is from left to right.

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Fig. 4

Velocity profile in the y-direction at x = 437.6 mm and z = 10 mm for Re = 1500 using three different mesh levels

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Fig. 5

Stream function for Re = 1500 (left column) and 4000 (right column) predicted by: (a) a two-dimensional simulation, (b) by a three-dimensional simulation, and (c) measured by PIV experiments

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Fig. 6

Vorticity contours (first row), normalized streamwise velocity [u/U] (second row), spanwise velocity [v/U] (third row), and normalized TKE (fourth row) for Re = 4000. Contours on the left column denote results predicted by the three-dimensional simulations while the contours on the right column denote results obtained by experiments.

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Fig. 7

Stream function for Re = 1500 at planes: (a) z = 1 mm, (b) z = 8 mm, and (c) z = 10 mm

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Fig. 8

Isotherms (first row), streamlines (second row), and vorticity field (third row) for Re = 4000. Contours at the left column denote results obtained for the nonslotted tube design and the contours at the right denote results for the slotted tube design.

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Fig. 9

Contours of the local heat transfer coefficient for the slotted and the nonslotted tubes at Re = 4000. (a) Upstream view, (b) downstream view, and (c) slot surface of the tube located at the second row and the second column. The bottom surface in (c) is the mid-plane and the top surface is the wall.

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