I spend so much money every term on this god forsaken institution where teaching is the side-hobby. I wish more professors were like you Dr. Randall! Thank you!
8:12 Which has the greatest fourier number question. Lets consider thermal diffusivity, which is a function of K in its numerator. So the higher k value will result in higher thermal diffusivity value, which then results in higher fouriers number value. From this we can conclude the bigger our K value, the bigger our fourier number will be. Very big K equals to very little heat resistance in an object. Case A shows very little resistance to heat transfer because the surface temperature is very similar to the mid plane temperature. So then I have determined case A has the greatest fourier number. Please let me know if my thought process is off.
I don't understand your question. Starting around 18:40 the length scale used in Bi number is explained. It is a little confusing, since it uses Ro/2 to check if lumped capacitance is valid, yet is Ro when looking up zeta1 and C1 in Table 5.1. Biot number is always dimensionless.
I meant at 28:25 when we found the Bi number we used Lc. Since the diameter is 3 cm (0.3m) shouldnt we use the Ro to be 0.015 to get 0.08036 than 0.15 to get 0.8036
I spend so much money every term on this god forsaken institution where teaching is the side-hobby. I wish more professors were like you Dr. Randall! Thank you!
nice video bro, see you soon. you keep it real mate
thank you very much Dr Randall , I would travel all the way from Jordan to take just one of your lectures !
Dr. Randall: True?
Yes, Dr. Randall. True.
Thanks a lot, professor, Hat's off to you!!
Thank you professor
Is there a Manteufel number?
8:12
Which has the greatest fourier number question.
Lets consider thermal diffusivity, which is a function of K in its numerator. So the higher k value will result in higher thermal diffusivity value, which then results in higher fouriers number value. From this we can conclude the bigger our K value, the bigger our fourier number will be. Very big K equals to very little heat resistance in an object. Case A shows very little resistance to heat transfer because the surface temperature is very similar to the mid plane temperature. So then I have determined case A has the greatest fourier number.
Please let me know if my thought process is off.
Yosief Amanios your ideas are good. I think it is same slab, so k not changed. What changes is time, and Fourier number proportional to time.
"HUUUUGE!!! difference"
For the Bi number in terms of Ro isn't it in meters ?
I don't understand your question. Starting around 18:40 the length scale used in Bi number is explained. It is a little confusing, since it uses Ro/2 to check if lumped capacitance is valid, yet is Ro when looking up zeta1 and C1 in Table 5.1. Biot number is always dimensionless.
I meant at 28:25 when we found the Bi number we used Lc. Since the diameter is 3 cm (0.3m) shouldnt we use the Ro to be 0.015 to get 0.08036 than 0.15 to get 0.8036
Unitless