Questions tagged [convection]

The tag has no usage guidance.

15 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
1 vote
0 answers
28 views

Can the Whitaker Nusselt number correlation be used for a hot sphere in convection with cool air?

The Whitaker Nusselt number correlation (equation 4 here if you don't know it) seems to not be applicable for when the viscosity of the fluid gets higher away from the surface, but it seems to get ...
user avatar
1 vote
0 answers
183 views

Errors obtained in the numerical solution of the 1D convection-diffusion equation

I have been trying to solve the 1D convection-diffusion equation In implementing the above, I have tried to follow closely the method described here: https://uk.mathworks.com/support/search.html/...
user avatar
  • 23
1 vote
0 answers
11 views

Heat Conduction/Convection Along discontinuous tube

I have a question regarding heat conduction/convection. I have a metallic tube over which a rope heater is wound, supplying power. A glass tube and a 2nd metallic tube lies at the exit of the first ...
user avatar
  • 11
1 vote
0 answers
193 views

Minimum distance between long curtains and radiator for good air flow?

It's a known fact that you cannot place a curtain near a radiator because it will trap hot air behind the curtain and also block cold air from going through the radiator from bellow. But obviously ...
user avatar
1 vote
0 answers
156 views

Ventilation requirements of a closed housing of a video wall

Our company builds rather large video walls that are driven by computers next to them. In one of our current project the size of the installation is 21 55" displays side by side in portrait mode and 4 ...
user avatar
  • 111
1 vote
0 answers
296 views

Calculating heat transfer in a cooling loop

Imagine a closed pipe like below, filled with a liquid. The pipe is copper. Then imagine a small point heat source of X watts applied to the outside of the pipe in the position shown. Heat warms the ...
user avatar
0 votes
2 answers
36 views

Heat transfer coefficient in forced convection and its dependence of temperature

I'm working on a Ansys Fluent of an Aluminium coil annealing furnace with the goal of estimating the heat transfer coefficients at different temperatures and ventilator/fan speed conditions. The ...
user avatar
  • 101
0 votes
1 answer
11 views

Does forced convection account for energy transfer in this case?

I have to confess that thermodynamics is not a friend of mine. My system consists of a volatile droplet sitting on a thermally conductive substrate. The energy balance comprises heat lost due to ...
user avatar
0 votes
0 answers
20 views

Simple simulation model of water boiling in a pot?

I want to investigate boiling processes (in the kitchen) by simulation. To this end I assume there is a pot ($m_\mathrm{pot}, C_\mathrm{pot}, T_\mathrm{pot}$) with some water inside ($m_\mathrm{water},...
user avatar
  • 101
0 votes
0 answers
24 views

Temperature of two aluminium plates heated by a heat source

This is my first question here, so, please, let me know if this is not the right place. I have a 3 m long, 4 mm diameter, 45 W heating cable that I need to place inside a fridge. Unfortunately, it ...
user avatar
0 votes
0 answers
33 views

Isn't the Newton's cooling law for heat convection too macroscopic for CFD simulations?

In CFD (Computational Fluid Dynamics) simulations, the space is discretised into a huge number of tiny cells and, therefore, one has the opportunity to use a model of heat transfer that takes into ...
user avatar
0 votes
0 answers
43 views

Handling the source term in the convection-reaction-diffusion equation

The 1D convection-reaction-diffusion equation for solute transport is given as: where C is the concentration, v is the flow velocity, D is the diffusion coefficient, S is the source/sink term, and R ...
user avatar
  • 1
0 votes
1 answer
44 views

Empirical correlation for low reynolds convective heat transfer coefficient

I am looking for a heat transfer coefficient for a shape (rectangular cross section preferred, could estimate with flow over flat plates) in 2 m/s cross flow. I have found a few empirical correlations ...
user avatar
0 votes
0 answers
38 views

How to calculate heat transfer between two solids in a medium?

If I have a cuboid block of metal and there is a cylindrical source of heat input (A) and I want to determine the heat energy at B (also cylindrical) how would I do this? I understand considerations ...
user avatar
  • 253
0 votes
1 answer
129 views

Wire heating and heat transfer in a cylindrical pattern

I have a series of copper coils with ¼” cooling plates between each coil. The cooling plates will be manufactured from aluminum and cooled using copper tubing. There are seven in series, and a plate ...
user avatar