in this case its a simple, conduction + Convection problem. if u have a respectable Heat transfer book u can get an equation that defines the heat transfer from an inclined plane to the atmosphere, and conduction is simple. and u don't have to take a semi-infinite solid, because the equations...
wait a minute, isn't it a question of only melting the ice on the windshiled? it can't be inside heating and where he had taken it as a semi-infinite solid !
now i've realized something. when i put thickness to the water plate it changes temperature, while if i put a no thickness plate it maintains its temperature, propably that was the difference between the heat transfer fluxes. i've tried the method u told me, unfortunately i can't trust my hand...
if water thickness is not that important,(which i know) but how did it change the answer from 600W-->5900W? i will remesh my volume, mayb try one without a boundary layer even though i think bdry layer is very important in such natural convection. btw. do u believe that the empirical equation...
i already did that. i installed boundary layers next to the area close to the pool but how do u check mesh convergence? Btw, before on the plate i put plate thickness of 2m which is the depth of the pool. in the next trial which i'm doing now i removed the thickness, the heat transfer rocketed...
well solution convergence. the equation geometry? the setting is normal convection over a horizontal plate. there's no integration and the like, just 1 simple derived formula. My setting is a pool inside a closed fixed temp room. i've taken the pool as a plate to be able to find the Heat...
the solution on Fluent is stable, i have 410000+ meshed volumes, the pc would explode if i add more. the answer is constantly 600W ! and i think it has reached convergence.
Hi all
I've been calculating heat convection off a horizontal heated plate to still cool air around it. Since the plate has a size of 50m2 the GrPr number is turbulent i there's no equation in my book to calculate heat transfer by convection for GrPr > 10^11, so i used the equation of GrPr at...
i'll work on the chemistry equation and see how to set it up. meanwhile i don't know if a formula like that could work, mayb u should check it out:
Power= Force*distance/time distance is the distance travelled by the piston in an amount of time (which u can get from RPM)..and u have the power...
i wonder if bernouilli's equation can be put to use in this case. i know that it can be used when there is wind driving a wind turbine. it should work here
ok follow this up, i hope ur familiar with the Staunton number: here goes
Eq.1: St*Pr=f/, f is the friction coefficient defined by:
Eq.2: Delta P (pressure difference)=f (L/d)(Rho)(Um^2/2g)
Um is the mean velocity
f=1.325/[ln(epsilon/3.7d)+5.74/Re^0.9]^2 for tubes..
Another approximation u...
using boundary layers
Well before u use this option u have to delete autosmoothing from Gambit..to do this Edit-->Defaults, then put autosmoothing to a value of zero.
Then after u open the boundary layer meshing first, the options are pretty straight forward, there are drawing that gambit will...
i didn't quite understand u where insulating what from what, but ur dealing with high temperatures here, and i think u should research professional companies, as for the calculations, after u choose the material u want u would be able to get the thermal conductivity constant from it and u can...
actually its 56% C and 44% H, and a value nearly equal to 7% to the final yield is used for bond breaking. but how can u ignore the energy needed to break the bonds? u can't do that.
i think the peak load needed can be calculated using Q=m c DeltaT, m being flow rate, c specific heat ratio, and DeltaT should be the difference in temperature from inlet to outlet thus telling us how much heat the water absorbed. after this step you would have to do complex forced...
WEll other than ur heat transfer book u can ask ur university for Fluent tutorials provided by the manufacturer of the program they have EXACTLY the same problem ur trying to solve, a tutorial involving phase change :). As for ideas i think fins is a good idea, other ideas would be difficult to...
Ok simple, we know that the pressure exerted by a fluid is explained by the following relation: P= rho * g * height of water. g is the gravity. now on the water side we have P = Rho of water*g*H on the other side we have
P= Rho water*g*H1 + Rho Oil*g*4H1 (since height of oil is 4 times that of...
try finding books of Mechanical Design subjects, or Theory of Machines. they usually contain such answers, they are long formulas with many many variables sometimes more than 8 variables that depend on the materials and applications of the spring. good luck
i didn't quite understand what you want, but i'm a Mechanical engineer and most of us know aerodynamics and heat transfer whether finite or not. i mean applications OF the SR-71? like spying?or research? then u move to sonic booms, which is all about physics and calculations, but are mostly...
i would go with the manometer, it is more accurate.
There is an error in the formula u r given, no wonder ur off target. the Nusselts number is DIRECTLY proportional to Reynolds number, so u have to lose the -8, actually the equation is: Nu= 0.023Re^0.8 x Pr^n. where n is 0.4 for heating of the...
well to calculate peak pressure i would normally use chemistry and assume full combustion. but if the torque is known, then u can calculate the force translated to the piston, having the area of the piston we know that P=F/A.
to find the force reaching the piston you would have to go through...
Here goes: i really had to dig up the past to get you the answers, lucky i still know where i have put them:)
In ideal combustion the combustion energy of hydrogen is 120000KJ/Kg, the 141800 is the higher heating value and cannot be used in engine yield calculations or combustion calculations...