Resistance number

For estimation purposes, using the above resistance numbers will be sufficient. 

In sedimentation, the Eule number is often referred to as the resistance number. Multiplying and dividing the RHS of equation 52 by n/8, we obtain... 

Freeze-thaw resistance (number of cycles to cause 7.5 42.5... 

Investigation of deactivation by gum formation and estimation of resistance numbers as a function of operating conditions and feedstock type are examples of bench-scale tests in which an insufficient heat loss compensation may spoil the results. 

The deactivation by formation of polymers, route 2, is enhanced at lower temperatures where the rate of hydrocarbon adsorption becomes higher than the hydrocracking rate of the adsorbed species (1,2,8). The deactivation rate by gum formation is usually defined in terms of a resistance number defined as kg hydrocarbon feed required to... 

The deactivation rate can be assessed from the profile as a resistance number, R (kg feed processed (g cat)" ) [392]. For prereforming, the resistance number R will increase with temperature and hydrogen partial pressure as hydrocracking of surface species takes over. It decreases with the final boiling-point temperature of the feedstock and in particular with the content of aromatics in the feed [322] as shown in Figure 5.31 [453]. 

A change in flow resistances, number of tubes and pool temperature would change the amount of energy transferred but not the mode of heat transfer. 

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