tube coefficient
1.CALCULATION AND ANALYSIS OF INTERNAL TUBE HEAT TRANSFER COEFFICIENT OF A FIN AND TUBE TYPE AIR COOLER HEAT EXCHANGER
2.Results show when velocity of flow remains unchanged in the onflow area and openness of the tube is changed, then resistance coefficient ζ changes obviously.
3.DISCUSSION ON RELATIONSHIP BETWEEN X-RAY ATTENUATION COEFFICIENT AND TUBE VOLTAGE
4.Through analyzing the constitution of condenser of centrifugal chillers,calculated the velocity of flow of cooling water by the pressure difference of cooling water in tube in accordance with Kern equation of shell and tube heat exchanger, then acquired the heat transfer coefficient of the condenser, finally, got out the condenser heat load and refrigeration capacity of centrifugal chillers.
6.Further more, the empirical formulas about average heat transfer coefficient and pressure drop of the DAE-2 tube and DAEC tube are given in this paper, which can be used to design condensers.
7.The results of numerical calculation show that: the heat transfer coefficient on shell-side of the spirally twisted flat-tube heat exchanger increases with increasing the Reynolds number,and decreases with increasing the S/de value of said twisted tube;
8.The immobile water content of tube bundle model can be considered the same as that of the two-region model. A simple relationship was established between dispersivity and the exponential term of the Brooks-Corey model, and then the hydrodynamic dispersion coefficient of the two-region model can easily be obtained from the soil water retention curve.
9.Abstract: In the internal circulating fluidized bed,there exist the moving zone,fluidizing zone and heat transferring zone with different fluidized air velocities.The convection heat transfer coefficient of immersed tube in the heat transferring zone is impacted by the velocity of the moving zone nearby and its data and change trend are obviously different with those of the common bubbling bed.The maximum heat transfer coefficient is evidently higher than that of the bubbling bed.As the bed materials have not been fluidized in the heat transfer zone,the coefficient has increased highly.The curve of that changes gently,feasilble to control the combustion intensity in the fluidizing zone.
10.The results computed show that 9 5% of coefficient of performance( COP )AND 6 7% of cooling power at 80 K could be gained,if a mixture pair of 10% nitrogen and 90% helium is used instead of pure helium for the pulse tube refrigeration.
