Dimensional Analysis in Chemical Calculation _3512

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Dimensional Analysis in Chemical Engineering Calculation

Have direct vascular resistance formula: △ = d2 we dimensionless points can also be used off Method is no phase change heat transfer process when the film coefficient of heat transfer per unit time, the heat transfer per unit area of the mouth known as the heat load, the value and 4 fluid velocity, density P, viscosity, thermal conductivity, thermal expansion coefficient of constant pressure, fluid and heat transfer surface temperature difference between the heat transfer surface △ t and the characteristic size of the work related. Within a certain range, assuming that the relationship between 0 and parameters of a simple exponential function can be expressed. Mouth 'work AtPC () where the dimensionless as the mouth - heat transfer / unit time per unit area q workers one by one ~ speed machine LT. 'Guizhou Normal University (Natural Science) - linear dimensions mL - Viscosity kgm · LMTP - density, thermal conductivity kg · mAlL --- J · m a s a kQL Jk 『k_. QWrite dimensionless equation is: QL: ZT -: [LT a [L) [0] CL a MT a) [0 a T-8-] [L. ], [0Af 101] [L one by one] t on both sides of the equation dimensionless according to the principle of equality can be obtained on the following five equations t heat 0I1 = + g on the time T; a 1 = a 2 a d-a temperature: 0 = c - g a pair of quality Ⅳ: 0 = d ten f-g on the length L: a mouth + a d 2 = 3f ten to one by one or more simultaneous solution of five equations can be obtained = mouth of a l +3 c = l + d = g a a 2h = l-gf = port index on behalf of the above ten 2h into the dimensionless equation. Q b ¨ l △ {) · (CP /) 9 · (9 △ tLaP / 2) as the Number Nusaiteer Ⅳ u, containing the required heat transfer film coefficient. mushrooms 3 Dimensional Analysis Zhao bless application in chemical engineering calculation for the Kaplan authorized _ the number of reaction and heat-related features. soap {Lu Lan as Grashof number of quasi-G,[link widoczny dla zalogowanych], the temperature difference due to different reaction caused by natural convection. 'ballast for the Reynolds number of potential reaction of the fluid flow state. u Nuseteer number of Ⅳ is beyond standard, PG function, so it can function expressed as: N = f (, P, G) can be seen from the above analysis, for the 8 physical (possession of their special status. This is because the chemical engineering experience in the technology by the process of scientific development will still encounter a lot of the current methods of pure mathematics can not describe the actual problem of silver and more, using this method can be easily known function is converted to non-storm times form the quasi-logarithmic equation. so it is not only a physical phenomenon for the local touch-type equation in the form of a powerful tool, but also chemical experimental design and experimental data processing of the commonly used chemical methods.