Recent content by SalusVF

Chestermiller, you're right! I will try to face this problem step by step. Let's see how far I go. Thanks a million!

It's not. I'm only adding more information. At this moment I don't know what else could be missing.

I couldn't imagine how this information could help you to know how to calculate the final speed. Anyway, it lasts like 20' to be in a steady state, but the thing is that this hot air is suddenly applied to the system, there is a valve that puts in contact this hot air with the cold one. I...

Nidium, I've been using the post you shared like this but I'm not sure about how to proceed: That is my system: I've supposed that the air is using the half pipe diameter to go up and the other half to go down, then I have these equations:$$\rho_{bottom} = \frac{353}{273 + T} \rightarrow...

Well, that is totally true. The data is collected during the transient period. I've been checking the data and I've seen that in 45s, beeing the lower temperature 48ºC, the higher has only increased 0.3ºC (24.2ºC -> 24.5ºC) . Is this information helpful?

I'm working in a project but I cannot give you more information about that. I'm sure that something happened because I've registered this convection. The thing is that I want to justify what is happening using maths, but at the moment I've had no success. Thank you for the comment.

Thank you! Here I post another block diagram that is probably closer to the reality. I hope it would be clarifying! PD: I agree with you regarding the speed profile. I think it would be like I have drawn in the center of the cylinder and oposite in both sides. In 3D i could imaging the...

Thanks for your suggestions, I have given more details in the Chestermiller answer. I hope you it could help.

Well, first of all thanks for your interest and your help, and secondly I'm sorry for the missing information but I'm not physicist. Let's take a look to the things that you've mentioned: Diameter: 81 mm Pipe type: PVC pipe 3 mm thick Pipe length: 30 cm Heater: 36 W resistance set at the bottom...

Well, the internal diameter is not shown, but I only need the expression that allows me to know the flow rate or the vertical speed due to convection. ¿Could you help me with this?

Thank you Chadi B Ghaith but there is a problem with your equation, I need to know the vertical speed of the air generated by the natural convection. Applying your equation in my problem Qa is also an unknown variable.

Hi guys, I'm doing some research in papers and literature to solve this problem but I've not found anything useful. I want to know the air velocity inside a pipe by the only effect of natural convection. I've attached a picture of the system right here: I hope you can help me to find the...