a) the limit occurs fir D< 0.4 l l = 1/ (square root of(8/pi)*n * sigma) and n can be found as in problem
so l = 1/ [(square root of(8/pi))* (P/kT) * pi *d2 ] = kT / (squareroot of (8pi)) * P * d2
where sigma= pi * d2 has been used . then
D < 0.4kT / (squareroot of (8pi)) * P * d2
and P = 0.4kT / (squareroot of (8pi)) * D * d2 =
[ 0.4 (1.38 X 10-23 J/K)(283K))] / [(100 X 10-6m) * (squareroot of (8pi) *(4.6 X 10-10m)2]
P = 14.7 Pa
(b)
A thin-walled vessel containing 2 liter of CO2 gas is kept at a temperature of 10°C....
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...