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陶文铨, L. B. WANG and W. Q. TAO†
Int. J. Heat Mass Transfer. Vol. 38, No.16, pp. 3053-3063, 1995,-0001,():
-1年11月30日
The periodically fully developed laminar heat transfer and fluid flow characteristics of an array of uniform plate length, aligned at angles to the air flow direction have been investigated numerically in the range Re=50-2300 using body-fitted coordinate system. Multisurface transformation is used in the grid generation in order to retain the periodic corresponding relations of the surfaces or lines in both physical and computational spaces. The computed results exhibit good agreement with the experimental data available in the literature. The results also show that both the intensity of heat transfer and the pressure drop increase with the increases in oblique angle and plate length.
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【期刊论文】NUMERICAL DESIGN OF EFFICIENT SLOTTED FIN SURFACE BASED ON THE FIELD SYNERGY PRINCIPLE
陶文铨, Y. P. Cheng, Z. G. Qu, W. Q. Tao, and Y. L. He
Numerical Heat Transfer, Part A, 45: 517-538, 2004,-0001,():
-1年11月30日
In this article, a numerical investigation of the flow and heat transfer in a three-row finnedtube heat exchanger is conducted with a three-dimensional laminar conjugated model Four types of fin surfaces are studied; one is the whole plain plate fin, and the other three are of slotted type, called slit 1, slit 2, and slit 3. AU four fin surfaces have the same global geometry dimensions. The three slotted fin surfaces have the same numbers of strips, which protrude upward and downward alternatively and are positioned along the flow direction according to the rule of "front coarse and rear dense." The difference in the three slotted fins is in the degree of "coarse" and "dense" along the flow direction. Numerical results show that, compared to the plain plate fin, the three types of slotted fin all have very good heat transfer performance in that the percentage increase in heat transfer is higher than that in the friction factor. Among the three siotted fin surfaces, slit 1 behaves the best, followed by slit 2 and slit 3 in order. Within the Reynolds number range compared (from 2,100 to 13,500), the Nusselt number of slit 1 is about 112-48% higher than that of the plain plate fin surface under the identical pumping constraint. An analysis of the essence of heat transfer enhancement is conducted from the field synergy principle, which says that the reduction of the intersection angle between the velocity and the temperature gradient is the basic mechanism for enhancing convective heat transfer. It is found that for the three comparison constraints the domain-average synergy angle of slit 1 is always the smallest, while that of the plain plate fin is the largest, with slit 2 and slit 3 being somewhat in between. The results of the present study once again show the feasibility of the field synergy principle and are helpful to the development of new types of enhanced heat transfer surfaces.
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【期刊论文】Refinement of the convective boundedness criterion of Gaskell and Lau
陶文铨, Hou Ping-Li, Tao Wen-Quan and Yu Mao-Zheng
Engineering Computations Vol. 20 No.8, 2003,-0001,():
-1年11月30日
Abstract Based on the normalized variable diagram, the weakness of the Gaskell and Lau's convective boundedness criterion (GL-CBC) is revealed by numerical example. By careful consideration of the smoothness of the normalized variable variation pattern, more rigorous constraints on the interface value interpolation are found. A new CBC is thus proposed, whose feasibility and correctness are demonstrated by the inspection of ten existing bounded schemes and a numerical example.
Stability (, control theory), ,, Numerical analysis,, Convection
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陶文铨, R. C, Xin and W. Q. Tao
Numerical Heat Transfer, vol. 14, pp. 465-481, 1988,-0001,():
-1年11月30日
Fluid flow and heat transfer in two-dimensional wavy channels of uniform cross-sectional area were analyzed numerically for constant-property Laminar flow. The channel walls were maintained at constant temperature. Streamwise pertodic geometry caused the flow and heat transfer to repeat periodically far downstream of the channel entrance. Computations were performed for different Reynolds numbers and geometric parameters. Prandtl number was kept constant (0.707). The whole solution domain was divided into five regions, and different coordinates were used for each region. The periodic boundary conditions were implemememted by mutual repiacements of field values at the two end regions. It was found that both Nussel: number and friction factor were greatly affected by Reynolds number and two geometric parameters.
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陶文铨, P.-W. Li, W.-Q. Tao
Warme-und Stoff,-0001,():
-1年11月30日
Three practices of treating outflow boundary condition were adopted in computations for convective heat transfer of a two-dimensional jet impinging in a rectangular cavity. The three practices were local mass conservation method, local one-way method and fully developed assumption. The numerical solutions of the three methods were compared with test data obtained via. naphthalene sublimation technique. It was found that the fully developed assumption was inappropriate, and the local one-way method could provide reasonably good results for the cavity bottom, while for the lateral wall the results with this method qualitatively differed from the test data. The solution with the local mass conservation method was the best. It thus suggested that for a problem expected with a strong recirculating flow at the exit of the computation domain, the local mass conservation method be adopted to treat the outflow boundary condition.
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