Heat Transfer Analysis of Laminar Flows Over Concave, Convex and Ribbed Surfaces


(*) Corresponding author


Authors' affiliations


DOI's assignment:
the author of the article can submit here a request for assignment of a DOI number to this resource!
Cost of the service: euros 10,00 (for a DOI)

Abstract


In the present study, the heat transfer characteristics of laminar air flows over concave, convex and ribbed surfaces has been investigated experimentally. Experiments are performed at the inlet Reynolds Numbers of 9×104 and 2×105.A constant–temperature hot wire anemometer and copper-constant thermocouples are used to measure velocity and temperature values, respectively. The results show that the heat transfer rates are increased by the concave e and ribbed surface comparing to the flat plate, while decreased by the convex surface. It is noted that ribs give the higher heat transfer augmentation than concave wall. Moreover, it is found that the heat transfer variations are more excessive at the bigger Reynolds Number on all surfaces


Copyright © 2013 Praise Worthy Prize - All rights reserved.

Keywords


Concave Curvature; Convex Curvature; Heat Transfer; Laminar Flow; Ribbed Surface

Full Text:

PDF


References


C.W. Leung, H.J. Kang, S.D. Probert, Horizontal simulated printed-circuit board assembly in fully-developed laminar-flow convection, Appl. Energy 56 (1997) 71–91.
http://dx.doi.org/10.1016/s0306-2619(97)00001-9

Y.-L. Tsay, J.-C. Cheng, Analysis of convective heat transfer characteristics for a channel containing short multi-boards mounted with heat generating blocks, Int. J. Heat Mass Transfer 51 (2008) 145–154.
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2007.04.006

J.P. Tsia, J.J. Hwang, Measurements of heat transfer and fluid flow in a rectangular duct with alternate attached detached rib-arrays, Int. J. Heat Mass Transfer 31 (1998) 1960–1972.
http://dx.doi.org/10.1016/s0017-9310(98)00300-7

M. Kanoun, M. Baccar, M. Mseddi, Numerical flow and heat transfer in a channel with various shaped ribs, Int. J. on Heat Mass Transfer 2 (2008) 489-498.

O.N. Sara, T. Pekdemir, S. Yapici, M. Yilmaz, Enhancement of heat transfer from a flat surface in a channel flow by attachment of rectangular blocks, Int. J. Energy Res. 25 (2001) 563–576.
http://dx.doi.org/10.1002/er.703

K. Aliane, passive control of the turbulent flow over a surface-mounted rectangular block obstacle and a rounded rectangular obstacle, Int. J. on Heat Mass Transfer 5 (2011) 305-314.

H.W. Wu, S.W. Perng, Effect of oblique plate on the heat transfer enhancement of mixed convection over heated blocks in a horizontal channel, Int. J. Heat Mass Transfer 42 (1999) 1217–1235.
http://dx.doi.org/10.1016/s0017-9310(98)00247-6

T.J. Young, K. Vafai, Convective flow and heat transfer in a channel containing multiple heated obstacles, Int. J. Heat Mass Transfer 41 (1998) 3279-3298.
http://dx.doi.org/10.1016/s0017-9310(98)00014-3

S.G. Taji, G.V. Parishwad, N.K. Sane, experimental investigation of heated horizontal rectangular fin array under mixed convection , Int. J. on Heat Mass Transfer 6 (2012) 104-112.
http://dx.doi.org/10.1007/s00231-014-1308-2

D.N. Ryu, D.H. Choi, V.C. Patel, Analysis of turbulent flow in channels roughened by two-dimensional ribs and three-dimensional blocks, Part II: Heat transfer, Int. J. Heat Fluid Fl. 28 (2007) 1112-1124.
http://dx.doi.org/10.1016/j.ijheatfluidflow.2006.11.007

J.C. Sturgis, I. Mudawar, Single-phase heat transfer enhancement in a curved, rectangular channel subjected to concave heating, Int. J. Heat Mass Transfer 42 (1999) 1255-1272.
http://dx.doi.org/10.1016/s0017-9310(98)00232-4

H. Umur, Flow and heat transfer with pressure gradients, Reynolds number and surface curvature, Int. Com. Heat and Mass Transfer 27 (2000) 397-406.
http://dx.doi.org/10.1016/s0735-1933(00)00120-2

T. Wang, T.W. Simon, Heat transfer and fluid mechanics measurements in transitional boundary layers on convex-curved surfaces, ASME Journal of Turbomachinery 109 (1987) 443-451.
http://dx.doi.org/10.1115/1.3262125

A.B. Turner, S.E. Hubbe-Walker, F.J. Bayley, Fluid flow and heat transfer over straight and curved rough surfaces, Int. J. Heat Mass Transfer 43 (2000) 251-262.
http://dx.doi.org/10.1016/s0017-9310(99)00128-3

H. Thomann, Effect of streamwise wall curvature on heat transfer in a turbulent boundary layer, J. Fluid Mechanics 33 (1968) 283-292.
http://dx.doi.org/10.1017/s0022112068001308

R.E. Mayle, M.I. Blair, F.G. Kopper, Turbulent boundary layer heat transfer on curved surfaces, ASME J. Heat Transfer 101 (1979) 521-525.
http://dx.doi.org/10.1115/1.3451021

S.J. Kline, F.A. McClintock, Describing uncertainties in single sample experiments, Mechanical Engineering 75 (1953) 3-8.

B.J. Abu Ghannam, R. Shaw, Natural transition of boundary layers-the effects of turbulence, pressure gradient and flow history, Proceedings of the Institution of Mechanical Engineers, Part C: J. Mechanical Engineering Science 22 (1980) 213-228.
http://dx.doi.org/10.1243/jmes_jour_1980_022_043_02


Refbacks

  • There are currently no refbacks.



Please send any question about this web site to info@praiseworthyprize.com
Copyright © 2005-2022 Praise Worthy Prize