Mean partial pressures

Pb.m Log mean partial pressure difference of stagnant gas B Dimensionless Dimensionless... 

D. Rectification in vertical wetted wall column with turbulent vapor flow, Johnstone and Pigford correlation =0.0.328(Wi) Wi P>vP 3000 < NL < 40,000, 0.5 < Ns. < 3 N=, v,.gi = gas velocity relative to R. liquid film = — in film -1 2 " [E] Use logarithmic mean driving force at two ends of column. Based on four systems with gas-side resistance only, = logarithmic mean partial pressure of nondiffusing species B in binary mixture. p = total pressure Modified form is used for structured packings (See Table 5-28-H). 

Mm = mean molecular weight of gas, Ib/lb mol Fbm = mean partial pressure of inert gas in the gas phase, atm... 

Z = height of packed section in tower, ft Apim = log mean partial pressure of gas in inlet and exit gas streams, atm... 

Pa is the density of air at its mean partial pressure, and X is the latent heat of vaporisation of unit mass of water. 

Pbm Logarithmic mean partial pressure kPa atm X Parameter used in entrainment -/- -/-... 

Pbm = logarithmic mean partial pressure of inert gas, atm P = total pressure, atm NRc = Reynolds number, gas phase Nsc = Schmidt number, gas phase... 

Conversion of solute in the gas phase is small. Thus, the extent of backmixing in the gas phase is unimportant. The interfacial concentration of the solute gas will be calculated at the log mean partial pressure of the inlet and the outlet. 

As indicated in the first three rows of Table 16.3, (16-8) and (16-9) can be written in terms of component partial pressure (p — p,) or concentration Q — C) driving forces, the corresponding mass transfer coefficients being designated kg and kc, respectively, for the gas, and ki for the liquid, in terms of a concentration driving force. The relationships between k and k in the different mass transfer expressions are given at the bottom of Table 16.3. Here Pbm is the log mean partial pressure of B, p is the gas density, and M is the average molecular... 

Pstn Logfflithmic mean partial pressure of inert gas B N/m ML- T 2... 

The calculation for Kga was based on the log-mean partial pressure of A in the gas, since the equilibrium pressure was zero. Correlations from the literature give the following values of the gas-film and liquid-film coefficients [28] ... 

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