its purely an assumption...if there is a condensate film already present we have to take film temperature(Tf-Ts)....if there is no film presence then we can go for saturation temperature(Tsat-Ts)...this is the concept....but if you are using a databook you can quote that databook and use that same formula
What is the name of your data book?
Why did you put density of water at 120 deg Celcius xalculating Renold num? Tf is 80 deg celcius here
In my data book for thickness (Tf-Ts) is given where Tf= film temp. Should I use it or yours?
its purely an assumption...if there is a condensate film already present we have to take film temperature(Tf-Ts)....if there is no film presence then we can go for saturation temperature(Tsat-Ts)...this is the concept....but if you are using a databook you can quote that databook and use that same formula
If Tf is 26°c , how to take properties values cos there is no number between 20°c and 40°c given in table data handbook?
Pls do interpolation...you can do it with your calculator itself...else do manually...
In the problem it is shown as vertical tube, but you have taken formula for vertical surface??
There will not be much difference bw vertical surface and tube..
@@VENKATQ can we also take the formula of vertical tube?
Where to find hfg?
It can be taken from Steam table...
Page no
Page number to find t saturation at given pressure
KINDLY REFER STEAM TABLE - PRESSURE TABLE
Sir
Iam getting Reynolds is 0.235