Recent content by Black-Mind

You will find what you want in this link http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322003000400012

Since you have the inlet tempreture and all the fluid properties you can calculate the effictiveness of the heat exchanger where E=q/qmax and then calculate the heat capacity ratio Cr And the overall heat transfer coefficient U Then by using E-NTU method u will have NTU=UA/Cmin where NTU can...

Thanks that was very helpfull

I'm new on MATLAB and I need to find the value that make the derivative of a function = 0 in order to find the maximum of my function I started by defining the variable T >> syms T Then I but my function >> f=((((cos(T))^2+(sin(T)*cos(T)))^2)+3*(((sin(T))^2+(sin(T)*cos(T)))^2))^(0.5)...

Thanx Nickjer For your help I finally get it

I try this but i don't no if it is right J=I/A=100*10^-9 /0.5*1 also J=(ne) V then ne(q)=J/v and then i take the q as the surface charge density and it well = 5*10^-9

I need the answer to this question A charge belt, 50cm wide, travels at 40m/s between a source of charge and a charging object at a rate corresponding to 100microA . Compute the surface charge density on the belt Some one told me the answer may be 5 microC/m2 but how ??