Experimental Studies of Heat Transfer

Most heat transfer studies were carried out under ambient conditions and with fine particles in small experimental sets. Though exhaustive reviews have been presented (e.g., Grace, 1986 Glicksman, 1988 Leckner, 1990), the data obtained at Tsing Hua University (Bi and Jin, 1989, 1990 Bai and Jin, 1992) will be the focus of this discussion and will be compared to the results of other researchers. 

Heat transfer processes occurring in fast fluidized bed generally include 

The dependence of heat transfer on operating conditions, gas/solid properties and the geometries of both the bed and the heat transfer surface, is illustrated conceptually in Fig. 1. 

The measured heat transfer coefficients are often represented as a function of solids concentration, as shown in the experimental data of Fig. 2 for a wide range of operating conditions, bed temperatures and solids sizes. It has been found that there exists the relation h oc (1 - e)n, in which the values of exponent n generally ranges from 0.5 to 1.0. The strong dependence of heat transfer coefficient on solids concentration implies that heat transfer between suspension and surfaces is dominated by a convective particle transfer process. 

Effect of temperature on heat transfer coefficient (Basu, 1990). 

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The Rowe-Claxton empirical equation has been found to conform to many experimental studies of heat transfer in a packed bed, such as the reactor typically used in the catalytic processes described earlier. It is first necessary in this situation to define die voidage of the system, AV, where... 

Talceislii, K., Matsuura, M., Aoki, S., and Sato, T., 1989, An Experimental Study of Heat Transfer and Film Cooling on Low Aspect Ratio Turbine Nozzles, ASME paper 89-GT-187. 

Results of experimental studies of heat transfer may be conveniently represented by means of the j- factor method developed by COLBURN4341 and by CHILTON arid COLBURN 35 for representing data on heat transfer between a turbulent fluid and the wall of a pipe. From equation 9.64 ... 

Sexauer (S8), 1939 Experimental study of heat transfer to and through condensate films. 

Anderson el al. (A4), 1961 Theoretical and experimental study of heat transfer to liquid films in vertical long-tube evaporators. Theory based on use of universal velocity profile. 

In Chapter 5, Z. Yu and Y. Jin of THU describe experimental studies of heat transfer between particle suspensions and immersed surfaces, enumerating the effects of variables and of the radial and axial distribution of the heat transfer coefficient. They then present an analysis of the mechanism of heat transfer, particularly in terms of particle convection. 

P. Schmitt, T. J. Poinsot, B. Schuermans, and K. Geigle. Large-eddy simulation and experimental study of heat transfer, nitric oxide emissions and combustion instability in a swirled turbulent high pressure burner. J. Fluid Mech., 570 17-46, 2007. 

Le Fevre, E.J. Rose, J.W. An experimental study of heat transfer by dropwise condensation. Int. J. Heat Mass Transfer 8 (1965) 1117-1133... 

Crawford, R.J. Scott, J.A. An experimental study of heat transfer during rotational moulding of plastics. Plast. Rubber Process. Appl. 1985, 5 (3), 239-248. 

S. Song, Analytical and Experimental Study of Heat Transfer Through Gas Layers of Contact Interfaces, PhD thesis, University of Waterloo, Waterloo, Ontario, Canada, 1988. 

E. K. Kalinin, G. A. Dreitser, and S. A. Yarkho, Experimental Study of Heat Transfer Intensification Under Condition of Forced Flow in Channels, Jpn. Soc. Mech. Eng. 1967 Semi-Int. Symp., Paper 210, JSME, Tokyo, Japan, September 1967. 

Graber, H. and M. Rieger. 1973. Experimental study of heat transfer to liquid metals flowing in line through tube bundles. Prog. Heat Mass Transfer 7 151-166. 

Experimental studies of heat transfer in flowing polymeric systems can be broken down into two categories. The first of the involved experimental measure-... 

The earliest experimental studies of heat transfer to flowing molten or thermally softened polymers were the papers of Beyer and Dahl [31] and Schott and Kaghan [32]. These dealt mainly with determining the radial point at which temperature approximated the mass average fluid temperature. Later Bird [33] measured a few experimental points that did not check well with theory. Gee and Lyon [19] also indirectly checked their theory by showing that calculated and experimental average flow rates of a thermally softened polymer undergoing heat transfer compared favorably. 

Golriz MR, Leckner B. Experimental studies of heat transfer in a circulating fluidized bed boiler. Proc Int Conf Engineering Application Mechanics. Sharif University of Technology, Vol. 3, 1992, pp 167-174. 

Shen X, Zhou N, Xu Y. Experimental study of heat transfer in a pressurized circulating bed. In Basu P, Horio M, Hasatani M, eds. Circulating Fluidized Bed Technology III. Oxford Pergamon Press, 1990, pp 451-456. 

Ma Y, Zhu J. Experimental study of heat transfer in a cocurrent downflow fluidized bed (downer). Chem Eng Sci 54 41-50, 1999. 

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