Hausen correlation

In the Hausen correlation, the mean Nusselt number is calculated as a sum of two terms the first term (Nu) is the fully developed value of the Nusselt number its value can be calculated by using the data quoted in the above sections. The second term takes into account the effects of the thermal entrance region. Rosehnow and Choi [7] give the value of the coefficients K, K, and b for circular channels in the case of prescribed wall heat flux (H boundary condition) and developed profile of velocity, Nu is equal to 48/11 (see Eq. 43) with Br = 5 = 0, = 0.023,... 

In the Hausen correlation, the Nusselt number is calculated as a sum of two terms the first term (Nu) is the fully developed value of the Nusselt number its value can be found in convective heat transfer in microchannels for the most common microchannel cross sections. The second term takes into account the effects of... 

Entrance Region, Table 3 Coefficients of the generalized Hausen correlation (Eq. 22) for hydrodynamically fully developed and thermally developing flow and for simultaneously developing flow in microtubes ... 

With the Hausen correlation [13], Nusselt numbers in the thermal entry length can be calculated ... 

Shah and Bhatti [2] and Hausen [20] have obtained the following correlations for the local and mean Nusselt numbers for the entire x+. 

But, if the pipe flow is developed concerning fluid dynamics but not concerning temperamre or concentration profile, then the following correlation for short pipes holds (Stephan 1959 Hausen 1959) ... 

At present, several experiments are available for inverse-detected one-bond heteronuclear shift correlation. The HMQC experiment described by Bax and Subramanian (1986) has probably been most widely employed. Alternatives, however, are available in the form of DEPT-HMQC (Kessler et al. 1989b) and the HSQC or so-called Overbodenhausen experiment (Boden-hausen and Ruben 1980). For alkaloids with highly congested proton spectra, DEPT-HMQC may be a useful alternative to HMQC, because it allows the acquisition of edited correlation spectra. For investigators interested in correlation of protons to alkaloidal nitrogen atoms via one or two bonds, HSQC or a doubly refocused variant may be the preferred choice. 

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