The change of the condensation heat transfer capacity for different volume ratios of helium in the noncondensable gases have been studied at the same time. The results indicate that the local heat transfer coefficient increases with the increasing wall subcooling for annular and wavy flow but ...
Newton's law of cooling states that the heat transfer rate leaving a surface at temperature Ts into a surrounding fluid at temperature Tf is given by the equation:Qconvection = h A (Ts - Tf)where the heat transfer coefficient h has the units of W/m 2 . K or Btu/s.in 2 .F. The...
Evaluation of heat transfer coefficient between a reacting steam-methane mixture and preheated Ni-based catalyst This work is devoted to the investigation of a heat transfer inside a steam methane reformer filled with pre-heated Ni-based catalyst pellets of various sh... D Pashchenko,I Karpilov...
The results show that there is a significant change in the angtilar variation of the internal heat transfer coefficient at low quality when compared with values for high quality. At low quality, the highest internal heat transfer coefficients are obtained on the tube surface farthest from the ...
Condensation (steam, filmwise)550 − 25,000 Forced convection (liquid metals)3000 − 110,000 Dimensional analysis of natural convection provides a correlation for the film coefficient, h, in the Nusselt number, Nu, where Nu = hd/k as a function of Grashof and Prandtl numbers as follows:...
Both the heat rate transformation coefficient and steam rate transformation coefficient are two of the principle parameters to reflect the character of extraction steam,making it easy to analyze the performance of a power unit under conditions of constant power output. 热耗变换系数和汽耗变换系数是反...
13. Heat convection coefficient and airway scale have little influence on the area of cooled zone by ventilation. 巷道壁面风流与围岩的换热系数和巷道的几何尺寸对巷道围岩的冷却范围影响非常小。 14. convection zone什么意思 14. Material selection of the superhigh pressure saturated steam superheating zone...
The outer diameter of the steam line is 18 in. and the outer surface temperature is 280oF. The convective heat transfer coefficient for the air is 18 Btu/hr-ft 2 - oF.Calculate the heat transfer rate from the pipe into the room if the room temperature is 72 oF....
[19] obtained heat transfer data for turbulent and laminar down-flows of water in a heating seven-rod bundle with s/d = 1.38. The heat transfer coefficient in down-flows was in good agreement with that in up-flows. Show abstract Natural circulation characteristics of a marine reactor in ...
The test results for average heat transfer coefficient ware correlated by the analysis within 15%. 展开 关键词: Tubes -- Fluid dynamics Heat -- Transmission Condensation Refrigerants Technical Report DOI: 10.1177/026765839000600101 被引量: 8