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convection
convection
convection 1. Vertical circulation within a fluid that results from density differences caused by temperature variations. Convection currents occur in the oceans when a water mass that is denser than the water below it sinks and is replaced by lighter, warmer water.
2. In meteorology, the process in which air, having been warmed close to the ground, rises. The convective uplift of
air parcels is one of the main processes leading to condensation and cloud formation. See also
DISH-PAN EXPERIMENT;
FORCED CONVECTION;
HADLEY CELL;
INSTABILITY; and
STABILITY.
3. Within the Earth, the
radiogenic heat release results in convective motions causing tectonic
plate movements. The location and configuration of the
convective cells is uncertain, but they appear to be
mantle-wide and marked by most heat loss along the
mid-ocean ridges. The difference in temperature between upgoing and down-going convective limbs within the mantle may be only 1–2°C. In the upper
oceanic crust, heat loss is mainly by convective circulation systems combined with thermal conduction. See also
CREEP MECHANISMS;
GEOTHERMAL GRADIENT;
HEAT FLOW;
NUSSELT NUMBER; and
RAYLEIGH NUMBER.
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Convection vs. infrared: advantages such as a smaller footprint, less power consumption, and quick startup and shutdown are making infrared technologies an increasingly popular choice for curing and drying applications.(EQUIPMENT: OVENS)
Magazine article from: Finishing Today; 8/1/2006; 700+ words
; Convection heating is widely known and easily accepted...shutdown. Although not as widely used as convection, infrared systems are quickly gaining...acceptance as an alternative to the standard convection technology. Following is a brief comparison...
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CONVECTION OVENS CAN SAVE ENERGY AND TIME
Newspaper article from: The Columbian; 2/21/1999; ; 700+ words
; ...What is the cost in energy usage for a convection oven? Several different types are being...efficient? C. Brockington, via e-mail Convection ovens are often billed as energy- and...your monthly electric or gas bill. Convection ovens are available in both gas and...
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 "Albany Times Union (Albany, NY)")
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CONVECTION CONVERTS GET HELP.(Life - Food)
Newspaper article from: Albany Times Union (Albany, NY); 4/6/2005; 700+ words
; ...RENALLS Knight Ridder You have a new convection oven but you don't know how to use...alone. While many people are buying convection ovens when they replace their stove...Unsure how to convert their recipes to convection times and temperatures, people turn...
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Convection Can Be Perfection.(ovens, chef Anthony Arbeeny comments on usefulness of item)(Brief Article)
Magazine article from: Foodservice Equipment & Supplies; 7/1/2001; ; 700+ words
; Convection ovens are workhorses in high-volume...should be what don't I prepare in my convection ovens," remarked Anthony Arbeeny...York. He, like many chefs, relies on convection ovens to produce large amounts of different...
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 "Buffalo News (Buffalo, NY)")
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Cooking with convection: Oven option is gaining popularity.
Newspaper article from: Buffalo News (Buffalo, NY); 1/24/2007; 700+ words
; Byline: Janice Okun Jan. 24--Convection ovens don't get much respect -- at...American kitchens that have them. The convection option, utilizing a fan to blow air...since the year 2000. In the home, convection is usually presented as an option in...
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Convection: A look at the transfer of energy via a moving fluid. (Energy Notes).(Brief Article)
Magazine article from: Process Heating; 1/1/2002; ; 700+ words
; ...ve never gotten into a discussion of convection heat transfer. After all, it is the...transfer: conduction, radiation and convection. Conduction deals with heat transfer...their energy is converted into hear. Convection is the transfer of energy via a moving...
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Elevated Convection and Castellanus: Ambiguities, Significance, and Questions
Magazine article from: Weather and Forecasting; 12/1/2008; ; 700+ words
; ABSTRACT The term elevated convection is used to describe convection where the constituent air parcels originate from a...above the planetary boundary layer. Because elevated convection can produce severe hail, damaging surface wind...
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Explicit Convection over the Western Pacific Warm Pool in the Community Atmospheric Model
Magazine article from: Journal of Climate; 5/15/2005; ; 700+ words
; ...application of the cloud-resolving convection parameterization (CRCP) to the Community...representation of the variability of convection are evident. In particular, the diurnal...scale organization of the tropical convection, especially superclusters associated...
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 "Portland Press Herald (Maine)")
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Cooking with CONVECTION ; 'Porsche of ovens' latest must-have for homeowners
Newspaper article from: Portland Press Herald (Maine); 2/19/2006; ; 700+ words
; ...Maine) 02-19-2006 Cooking with CONVECTION ; 'Porsche of ovens' latest must...life that he can't live without: a convection oven. As a pastry chef, he learned...difference." BECOMING MORE MAINSTREAM Convection ovens contain a fan that circulates...
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Cooking with convection Smart ovens help get meal on table faster
Newspaper article from: The Pantagraph Bloomington, IL; 10/8/2005; ; 700+ words
; ...load of laundry. Ovens that combine convection and microwave technologies cook food...side dishes in 25 percent of the time. Convection ovens have been around since the '80s...bag with scratchy napkins. The way convection works is simple: a fan in the rear...
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Convection
Book article from: Science of Everyday Things
CONVECTION CONCEPT Convection is the name for a means of heat transfer, as distinguished from...waters, and solid earth. In the atmosphere, hot air rises on convection currents, circulating and creating clouds and winds. Likewise...
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Convection (Updrafts and Down-drafts)
Book article from: World of Earth Science
Convection (updrafts and down-drafts) Convection is the vertical transfer of mass, heat, or other properties...fluid or substance that undergoes fluid-like dynamics. Convection takes place in the atmosphere, in the oceans , and in...
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convection
Book article from: The Columbia Encyclopedia, Sixth Edition
convection mode of heat transfer in fluids (liquids and gases). Convection depends on the fact that, in general, fluids...heated and also rise. Thus, a current, called a convection current, becomes established in the fluid, with...
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mantle convection, plumes, viscosity, and dynamics
Book article from: The Oxford Companion to the Earth
mantle convection, plumes, viscosity, and dynamics...radiogenic sources. Conduction, unlike convection, requires no movement of material...can be achieved more efficiently by convection. Heat can be transported to the Earth...
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convection current
Book article from: World Encyclopedia
convection current In geology, heat generated from radioactivity deep within the Earth's mantle...the rising rock is deflected laterally below the crust before sinking. This mantle convection is thought to drive plate tectonics .
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