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Questions tagged [convection]

transport mechanism involving bulk motion of a medium

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How is fin efficiency a useful quantity for a fin's heat dissipation performance? [closed]

I mean, it's the ratio of actual heat transfer to heat transfer if the material had infinite conductivity. How is it of any practical, or even theoretical use? How does it help, in saying one fin ...
54 views

Is a Microwave oven without a faraday cage a health hazard?

Microwave ovens have something of a Faraday-cage/shield to keep from leaking (emitting) EM radiation. What would happen if the shield or the door was removed? No doubt it would be less efficient as ...
31 views

Limits to natural convection in a non-infinite medium

I'm trying to understand the temperature profile of a fluid in an underground vertical pipe without flow. The fluid is subject to a boundary condition of the form: $$Q = h[T_e(z) - T],$$ where $Q$ ...
14 views

Conservative or non conservative convection

I want to describe the convection of a species $B$ by another species $A$. Meaning that $A$ is bringing $B$ with it, and there is no other velocity associated to $B$. So I have 2 conservation ...
44 views

Effect of volumetric flow rate on convection and radiation heat fluxes

Say we have two hot objects of the same material but of different width and same thickness. The objects are moving horizontally, have initially the same temperature and are cooled by a gas blown from ...
38 views

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What is meant by “stable/unstable to convection” in the context of the solar atmosphere?

In studying the Schwarzschild stability criterion (for the solar atmosphere); $$\left\lvert\frac{dP}{dr} \right\rvert\lt\frac{\gamma P}{\rho}\left\lvert\frac{d\rho}{dr}\right\rvert$$ From my notes are ...
127 views

Finding the temperature of the glass envelope in an incandescent light bulb

I've been trying to evaluate the temperature of an incandescent light bulb, using radiation for the filament and convection for the bulb, the radiation's equation works fine, but the problem is the ...
79 views

Coupling Navier-Stokes and stochastic models for particle tracking in micro-scale free convection?

I have been using a commercially available software to simulate laminar free convection in a specific small domain (let's use channel w/ heated lower wall as an example). The scale is approx 50-100 ...
109 views

How buoyancy and convection are related?

If I'm not wrong buoyancy formula is $$F_{B}=\rho gv_{sub}$$ In convection it is said that fluids with less density come up and parts with lower density ,which are cooler , go down and this cycle ...
235 views

Why do distinct temperature layers form in bodies of water?

This may not be the correct place to ask a question about limnology (which I just found out is the science of lakes) but it seems like the place most likely to produce a good answer. In my diving ...
79 views

Is there heat transfer through radiation in a drinking flask with styrofoam insulation?

Suppose we have a drinking flask with styrofoam between outer and inner walls. The heat can be transferred through styrofoam by conduction. Is the heat transferred by radiation as well? My lecturer ...
224 views

Atmospheric pressure And heat convection

If hot air rises due to convection, why does it get colder when we climb mountains? After some research, I found out that atmospheric pressure affects the temperature of the surroundings. Another ...
151 views

Combined radiation with conductive and convective heat transfer

I have a tube(only the cross-section displayed in the figure!), where gas flow is used to heat up the water. The water flows inside the steel tube, where the walls have been marked red. The heat ...
208 views

Energy Transport in stars

I'm trying to understand why convection is an efficient mode of energy transport in the outer layers of the solar interior. Could anyone give me a little bit of knowledge?
37 views

Inertial reference frames in an atmospheric science context

A Hadley cell cycles air meridionally between the equator and 20 ◦ latitude. Assuming no zonal wind at the equator, what is the mean speed and direction of the trade winds at 20 ◦ ? My instructor ...
85 views

Understanding the meaning of a certain boundary condition

Given, $$-k\frac{\partial T }{ \partial y}=h(T_f-T),$$ what does this term $$\left.{\partial T \over \partial y}\right|_{y =0}$$ physically describe in the convective boundary condition?
38 views

Convection through a bigger window

So I am currently doing an investigation and the location that I chose for the project is a rainforest. So I was wondering if the window is bigger in my tree house will it affect the way convection ...
394 views

How do convective clouds form?

What are necessary conditions to form convective clouds with their flat cloud base, like this one: I know that convective instalibity at the ground is at start of the process, but I have realized ...
79 views

Convection current

I am a master student (geology), I seek to ask how one can simulate convection current movement. What the difference between Boussinesq approximation and non Boussinesq approximation, and what are the ...
584 views

Prevost Theory of Exchange

I am having a trouble in understanding this concept. If bodies are at thermal equilibrium, there is no heat transfer. Heat is transferred through three different ways: Conduction, convection and ...
382 views

mysterious waves while boiling water

When you take a container with water and begin to heat it, after a while, you will notice that bubbles begin to form. If you wait a bit longer, you will easily (it's so clear) start noticing smudgy ...
75 views

Air temperature that would cause same rate of heating to human body as a 40°C hot tub

My son was wondering why a 104°F (40°C) hot tub feels so much hotter than a 104° day. I explained the difference between conduction and convection but we started wondering how hot the air would have ...
248 views

Air pressure and convection currents

Air pressure decreases with increasing altitude. So why is air near the surface not continuously drawn upward toward the lower-pressure regions above? Does this have anything to do with ...
52 views

Nusselt number in Rayleigh-Bénard convection derivation

I read, that for a box with length L, with heated bottom and cooled top and boundary layers of thickness $\delta$, the Nusselt number Nu can be approximated as  \text{Nu}= \begin{cases} 1,& ...