convection

Definitions

  • WordNet 3.6
    • n convection the transfer of heat through a fluid (liquid or gas) caused by molecular motion
    • n convection (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere
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Webster's Revised Unabridged Dictionary
    • Convection (Physics) A process of transfer or transmission, as of heat or electricity, by means of currents in liquids or gases, resulting from changes of temperature and other causes. "Liquids are generally heated by convection when heat is applied from below."
    • Convection The act or process of conveying or transmitting.
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Century Dictionary and Cyclopedia
    • n convection The act of carrying or conveying; specifically, the transference of heat or electricity through the change of position of the heated or electrified body: distinguished from conduction (which see). When a portion of a liquid or a gas is heated above the temperature of surrounding portions, it increases in volume, and, thus becoming specifically lighter, rises, while the cooler portions of the fluid rush in from the sides and descend from the upper parts of the vessel. Convection currents are thus produced, and the liquid or gas is soon heated throughout. This principle is used in heating a house by a hot-air furnace. The Gulf Stream is a grand convection current, carrying the heat of the equator toward the pole. (See heat.) Similarly, electricity may be transmitted by convection by the motion of the electrified body itself, as when the electricity of a conductor is discharged by a point, it being carried off by a stream of electrified air-particles.
    • n convection by liberation of the latent heat of evaporation which remains with the aqueous vapor contained in the air until it is liberated by condensation into cloud. In so far as the liberated heat remains in the cloud, it may be consumed in reëvaporating the cloudy particles or be lost by radiation; in so far as it is brought down to the earth with the rain or snow, it affects the local climate powerfully.
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Chambers's Twentieth Century Dictionary
    • n Convection kon-vek′shun the process of transmission of heat or electricity through liquids or gases by means of currents
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Etymology

Webster's Revised Unabridged Dictionary
L. convectio, fr. convehere, to bring together; con-, + vehere, to carry
Chambers's Twentieth Century Dictionary
L.,—con, and vehĕre, to carry.

Usage

In literature:

Convection is responsible for winds and ocean currents, for land and sea breezes, and other daily phenomena.
"General Science" by Bertha M. Clark
Sedimentation from this point of view is a convection of energy.
"The Birth-Time of the World and Other Scientific Essays" by J. (John) Joly
There must have been some convection current in the ancient ocean that had swirled them all into this one place.
"Little Fuzzy" by Henry Beam Piper
Thermal convections; air starts to cool when it gets dark, and then heats up again in double-sun daylight.
"Oomphel in the Sky" by Henry Beam Piper
We'll be cooled by conduction and convection.
"Islands of Space" by John W Campbell
Does the heat reach the hand by convection?
"Ontario Teachers' Manuals: Nature Study" by Ontario Ministry of Education
AIR CARRIES HEAT BY CONVECTION.
"Common Science" by Carleton W. Washburne
The escape of heat from a cooling mass is effected by conduction, or by convection, or by both.
"Essays: Scientific, Political, & Speculative, Vol. I" by Herbert Spencer
Gerdien's estimate of the convection current is for fine weather conditions.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 8" by Various
The tube C is a connecting tube bent downwards so as to prevent the mixing of the solutions by convection currents.
"The Phase Rule and Its Applications" by Alexander Findlay
In convection currents electricity is carried from place to place with and on moving material bodies or particles.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2" by Various
The upper limit of the "earth" haze is determined by the height of diurnal atmospheric convection.
"Visual Illusions" by Matthew Luckiesh
This law of convection is applied to maintain a circulation of hot water in pipes used for warming a house.
"Household Administration" by Various
This is because the trades are produced by the convection due to excessive heat along the heat equator.
"Climatic Changes" by Ellsworth Huntington
Your oven in your range works by convection.
"Electricity for the 4-H Scientist" by Eric B. Wilson
He showed also some interesting experiments in which the effect of convection is illustrated.
"The inventions, researches and writings of Nikola Tesla" by Thomas Commerford Martin
It is obvious that this should be the case, but the result cannot generally be applied to convection currents.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2" by Various
Thus water is heated by convection of heat.
"Curiosities of Heat" by Lyman B. Tefft
This was placed in the room and provided heat by conduction, convection, and radiation.
"Physics" by Willis Eugene Tower
Whether or not convection is important at the microscopic level remains an experimentally unsolved question.
"Significant Achievements in Space Bioscience 1958-1964" by National Aeronautics and Space Administration
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In poetry:

The mounted disk of ebonite
Has whirled before, nor whirled in vain;
Rowland of Troy, that doughty knight,
Convection currents did obtain
In such a disk, of power to wheedle,
From its loved North the subtle needle.
"Answer To Tait" by James Clerk Maxwell

In news:

Vulcan PowerSteam™ Series Countertop Convection Steamers Vulcan's innovative PowerSteam™ enables higher production in a smaller footprint and requires less labor.
Suddenly flawed Falcons part of an imperfection convection .
IFR Strategies In Convective Weather.
New convective wx tool goes online.
The second time I made this, I used the convection feature on my oven, and that is the way to go.
(Convection oven to 425 degrees) Rinse and pat dry the scallops.
A moon rock brought back by astronauts from the last Apollo mission in 1972 has finally proven its worth by revealing that the moon used to have a hot, convecting molten core that generated a magnetic field.
Most radiators use a combination of convection and radiation to heat their surroundings.
Cooks can operate the units in any one of the three operating modes— steam , convection or steam plus convection.
The fun continues with today's giveaway of an awesome West Bend Convection Toaster Oven .
New 2011 Roadtrek 210-SS- Agile $95,360 Roadtrek Class B Coach w/Rear Electric Power Sofa & Table Converts to Twin-Like Beds or King Size Bed, Convection Microwave Oven, Opt.
Convection heat doesn't dry the air as much as a woodstove.
If you are making a long cooked roast make a pile on one side of the grill (and cook the meat on the other — you'll form a natural convection oven).
Heat oven to 350°F (convection oven to 325°F).
Disorganized Convection in the E. Atlantic remains unsettled but no development is likely & -- if so -- would stay in the E. Another coastal low.
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In science:

Mc ≡ 4πR2 (yb - yc ) is the mass of the convection zone.
Rotational Evolution During Type I X-Ray Bursts
The lower panels of Figure 2 show ∆Ω/Ω(y) ≡ (Ω⋆ Ω(y))/Ω⋆ as a function of column depth for the different convective models in Table 3.
Rotational Evolution During Type I X-Ray Bursts
As we described above, in radiative zones the spin down depends on height, whereas convective zones are rigidly rotating.
Rotational Evolution During Type I X-Ray Bursts
For both convective and fully-radiative models, the ∆Ω/Ω(y) is smaller by roughly a factor of two for pure He ignition as opposed to mixed H/He ignition.
Rotational Evolution During Type I X-Ray Bursts
We compute simple models of convective for the whole duration of the burst.
Rotational Evolution During Type I X-Ray Bursts
While convection may enforce rigid rotation in the early stages of a burst, we do not expect the atmosphere to be convective in the cooling tail (see §2.2).
Rotational Evolution During Type I X-Ray Bursts
We find that the convective instability overcomes the Rossby wave restoring force when the shear velocity is greater than the Rossby wave speed, U > URo ≈ 2Ωλ2 ⊥/R (see also Pedlosky 1987).
Rotational Evolution During Type I X-Ray Bursts
Later in the burst, the convection zone retreats, leaving a purely radiative atmosphere.
Rotational Evolution During Type I X-Ray Bursts
For a given flux, the convective models have a greater thickness than fully-radiative models because the temperature pro file is steeper in the convection zone, giving a larger base temperature (compare Tables 3 and 4).
Rotational Evolution During Type I X-Ray Bursts
Comparison between measured and theoretical values of P obtained with different models of turbulent convection will then provide valuable information about the properties of stellar convection zones.
Seismic diagnostics on stellar convection treatment from oscillation amplitudes of p-modes
Indeed around the middle of the convective core, the convective luminosity peaks at between 30% and 50% of the star’s surface luminosity L∗ ∼ 19L⊙ , where L⊙ is the solar luminosity; this corresponds to roughly 90% of the local luminosity L(r), the remaining being transported by radiation.
Looking Deep Within an A-type Star: Core Convection Under the Influence of Rotation
Analyses of a 3D simulation of the upper layers of a solar convective envelope provide constraints on the physical quantities which enter the theoretical formulation of a stochastic excitation model of solar p modes, for instance the convective velocities and the turbulent kinetic energy spectrum.
Numerical constraints on the model of stochastic excitation of solar-type oscillations
The resulting values are found ∼ 5 times larger than the values resulting from a computation in which convective velocities and entropy fluctuations are obtained with a 1D solar envelope model built with the time-dependent, nonlocal Gough (1977) extension of the mixing length formulation for convection (GMLT).
Numerical constraints on the model of stochastic excitation of solar-type oscillations
These convection parameters are calibrated to a solar model to obtain the helioseismically inferred depth of the solar convection zone of 0.287 of the solar radius (Christensen-Dalsgaard, Gough & Thompson 1991).
Numerical constraints on the model of stochastic excitation of solar-type oscillations
The decrease of Φ(z ) with depth is explained first by the onset of the convection and the formation of convective plumes at z ∼ 0 and then by the relative increase in number of the plumes inward in the simulation.
Numerical constraints on the model of stochastic excitation of solar-type oscillations
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