In the calculation, heat transfer and flow resistance are researched at the same Reynolds number of 200 when the value of C0 defined as intensity coefficient changes. From Eq. (6), C0 is the constraint coefficient of fluid power consumption, and it corresponds to certain fluid power consumption. So Figs. 2e5 show the optimum velocity and temperature field at different value of fluid power consumption. From Eq. (14), the value of C0 is related to the intensity of additional force. That is to say, the intensity of additional force is different in the flow whose fluid power consumption has different value, and the optimum field and the performance of heat transfer and flow resistance are different. Figs. 2e5 show the temperature field and radial velocity vector at different values of C0. All the graphics are taken from the cross-section of the tube where L ¼ 1400 mm. When C0 is too large, the calculation cannot get a convergent solution. In comparison with the flow in a circular tube, longitudinal vortexes are formed in the flow structure when C0 is set appropriate values. From Fig. 2, it can be found that when the value of C0 is small, the intensity of virtual heat field is weak and the number of vortexes is four. The range of influence on flow field by vortexes is wide both in the core flow and near the tube wall. The
form of temperature field is changed from concentric circles to two
In the calculation, heat transfer and flow resistance are researched at the same Reynolds number of 200 when the value of C0 defined as intensity coefficient changes. From Eq. (6), C0 is the constraint coefficient of fluid power consumption, and it corresponds to certain fluid power consumption. So Figs. 2e5 show the optimum velocity and temperature field at different value of fluid power consumption. From Eq. (14), the value of C0 is related to the intensity of additional force. That is to say, the intensity of additional force is different in the flow whose fluid power consumption has different value, and the optimum field and the performance of heat transfer and flow resistance are different. Figs. 2e5 show the temperature field and radial velocity vector at different values of C0. All the graphics are taken from the cross-section of the tube where L ¼ 1400 mm. When C0 is too large, the calculation cannot get a convergent solution. In comparison with the flow in a circular tube, longitudinal vortexes are formed in the flow structure when C0 is set appropriate values. From Fig. 2, it can be found that when the value of C0 is small, the intensity of virtual heat field is weak and the number of vortexes is four. The range of influence on flow field by vortexes is wide both in the core flow and near the tube wall. Theform of temperature field is changed from concentric circles to two
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