Try working out the nusselt number with the values given and 0.915 you worked out.
Once you have nu you can then put this into the heat transfer coefficient equation
Thanks, rough sketch shows the air being forced into surface, this will create turbulent flow? But can't find anything on how to approach this and it is both linear and turbulent to some extent
Thanks
Hi All,
I have a situation were I need to evaluate the heat transfer coefficient of a horizontal surface. The surface has tubes within although I first used "flow across a bank of tubes", this has been untrue due to the air flow coming from above the surface flowing vertically (and...
5000N x 2m - ((m1 x .1m x157^2)x1.5) - ((m2 x .1m x 157^2)x0.5m) =0
10,000 - (m1 x 3697.35) + (m2x1232.45)=0
10000/(3697.35+1232.45)=m1+m2
2.028= m1+m2
Pretty sure this is wrong to be honest but not sure where to go from here or what approach I should be making
Thanks
Homework Statement
A shaft 2 m long rotates at 1500 revs min–1 between bearings as
shown in FIGURE 2. The bearings experience forces of 5 kN and
3 kN acting in the same plane as shown. A single mass is to be used
to balance the shaft, so that the reactions are zero. The mass is to be
placed at...
What would the usual difference be between inlet and outlet temperatures with regards to flue gas as I have worked it out although it barely differs from the inlet temp (around4 degrees) surely I have gone wrong?
Yes it is the final part there is one after the flame temp question that I believe to have completed just the notes are not very clear,
The flow rate of flue gas is 1400 kmol h^-1
And it does not state any water feed rate, what is the equation that you are intending on using please
Thanks for your reply, so is there a different equation that is used? Because you do not need to use specific heat capacity when using the method I described I believe
Homework Statement
If the flue gases exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28 C to 90 C and assuming:
• a mean specific heat capacity for water over this temperature range to be 4.2 kJ kg–1 K–1
a mean molar heat capacity for the flue...
Hi I was wondering if you would know what equation to use for this ...
(i) If 5% of the heat available for steam production is lost to the atmosphere, determine the amount of steam raised per hour when the total flow of flue gases is 1400 kmol h–1.
Can I just deduct 5% from the heat...
No problem, the lecturer has stated we can use the same value for both butane and butene although these are slightly different. 1-2% would not change my final value so it would fit that of the table.
Is it possible it is above 2200 deg C or is this too high ?
The question stated max temp so...