Definition & Meaning | English word CONVECTION

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Definitions of CONVECTION

1. (obsolete) The process of conveying something.
2. (physics) The transmission of heat in a fluid by the circulation of currents.
3. (meteorology) The vertical movement of heat and moisture, especially by updrafts and downdrafts in an unstable air mass. The terms convection and thunderstorm are often used interchangeably, although thunderstorms are only one form of convection. Towering cumulus clouds are visible forms of convection.

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Examples of Using CONVECTION in a Sentence

• He contributed extensively to fluid dynamics, with concepts such as the Rayleigh number (a dimensionless number associated with natural convection), Rayleigh flow, the Rayleigh–Taylor instability, and Rayleigh's criterion for the stability of Taylor–Couette flow.
• They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection.
• The realm of geochemistry extends beyond the Earth, encompassing the entire Solar System, and has made important contributions to the understanding of a number of processes including mantle convection, the formation of planets and the origins of granite and basalt.
• Convection is single or multiphase fluid flow that occurs spontaneously due to the combined effects of material property heterogeneity and body forces on a fluid, most commonly density and gravity (see buoyancy).
• Therefore, it can be used to determine the thermal conductivity of gases at high temperatures, where it is difficult to measure experimentally due to the formation of convection currents.
• The Rayleigh number, shown below, is a dimensionless number that characterizes convection problems in heat transfer.
• When the Rayleigh number, Ra, is below a critical value for a fluid, there is no flow and heat transfer is purely by conduction; when it exceeds that value, heat is transferred by natural convection.
• In convective heat transfer, Newton's Law is followed for forced air or pumped fluid cooling, where the properties of the fluid do not vary strongly with temperature, but it is only approximately true for buoyancy-driven convection, where the velocity of the flow increases with temperature difference.
• The star's magnetic field is created by convection throughout the stellar body, and the resulting flare activity generates a total X-ray emission similar to that produced by the Sun.
• It is less dense than most of the other constituents of air and triggers convection currents that can lead to clouds and fog.
• Across the north Atlantic and southwest Indian Ocean, they require some central convection fairly near the center surrounding a warming core existing in the mid-levels of the troposphere.
• Summer weather in Brian Head is influenced by the tail end of the North American Monsoon, which provides frequent thunderstorms in July and August, though convection is inhibited by the cool temperatures at Brian Head's extreme altitude.
• The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo.
• As convection from a warm surface heats the air around it, an insulating boundary layer of warm air forms against the surface.
• Advection is sometimes confused with the more encompassing process of convection, which is the combination of advective transport and diffusive transport.
• The Biot number is the ratio of the thermal resistance for conduction inside a body to the resistance for convection at the surface of the body.
• Experiments conducted were: Crystal Growth Furnace (CGF); Drop Physics Module (DPM); Surface Tension Driven Convection Experiments (STDCE); Zeolite Crystal Growth (ZCG); Protein Crystal Growth (PCG); Glovebox Facility (GBX); Space Acceleration Measurement System (SAMS); Generic Bioprocessing Apparatus (GBA); Astroculture-1 (ASC); Extended Duration Orbiter Medical Project (EDOMP); Solid Surface Combustion Experiment (SSCE).
• The star's surface has a magnetic field hundreds of times as strong as that of the Sun, generated by its thorough internal convection.
• The temperature profile of the atmosphere is a result of the interaction between radiative heating from sunlight, cooling to space via thermal radiation, and upward heat transport via natural convection (which carries hot air and latent heat upward).
• The Sun's photosphere is composed of convection cells called granules, which are rising columns of superheated (5,800 °C) plasma averaging about 1,000 kilometres in diameter.

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