Questions tagged [convection]
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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 ...
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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/...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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},...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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