This is the reason why English is the second language learned by most of the people. Copyright © 2011. The air thus circulates by convection, creating winds. convention meaning in tamil: மாநாடு | Learn detailed meaning of convention in tamil dictionary with audio prononciations, definitions and usage. being found guilty of any crime by a legal tribunal. Convective heat transfer is a mechanism of heat transfer occurring because of bulk motion (observable movement) of fluids. Heat transfer by natural convection plays a role in the structure of Earth's atmosphere, its oceans, and its mantle. The convection mechanism is also used in cooking, when using a convection oven, which uses fans to circulate hot air around food in order to cook the food faster than a conventional oven. It may also be said to be due to combustion, capillary action, or Marangoni and Weissenberg effects. The current in an electrolyte would therefore be also a current of convection; now, it acts on the magnetic needle. Natural convection, or free convection, occurs due to temperature differences which affect the density, and thus relative buoyancy, of the fluid. Usage Frequency: 1 Tamil is a very old classical language and has inscriptions from 500 B.C. Reference: Wikipedia, Last Update: 2016-03-10 Latitudinal circulation occurs because incident solar radiation per unit area is highest at the heat equator, and decreases as the latitude increases, reaching minima at the poles. வெப்பச்சலனம் தமிழ் அர்த்தம். It consists of two primary convection cells, the Hadley cell and the polar vortex, with the Hadley cell experiencing stronger convection due to the release of latent heat energy by condensation of water vapor at higher altitudes during cloud formation. adjudging, guilty of an offense. The resulting Sverdrup transport is equatorward. admission of a truth; confutation. This can be contrasted with conductive heat transfer, which is the transfer of energy by vibrations at a molecular level through a solid or fluid, and radiative heat transfer, the transfer of energy through electromagnetic waves. Found 0 sentences matching phrase "convection oven".Found in 0 ms. The net result is a slow circulation of particles downward at the sides, and upward in the middle. Gooch J.W. Ice convection on Pluto is believed to occur in a soft mixture of nitrogen ice and carbon monoxide ice. “Democrat” vs. “Republican”: Where Did The Parties Get Their Names? As the moist air rises, it cools, causing some of the water vapor in the rising packet of air to condense. A typical granule has a diameter on the order of 1,000 kilometers and each lasts 8 to 20 minutes before dissipating. I, The Foundations of Science: Science and Hypothesis, The Value of Science, Science and Method, A Guide to the Scientific Knowledge of Things Familiar, Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 8. A common example of natural convection is the rise of smoke from a fire. On the reservation in job and educational opportunities in both government and private sectors the convention said the reservation policy should be on the basis of the population of the community concerned. Quality: In: Gooch J.W. Tamil language is one of the famous and ancient Dravidian languages spoken by people in Tamil Nadu and the 5th most spoken language in India, Tamil is also an official spoken language in Sri, anka & Singapore. Associated with a thermal is a downward flow surrounding the thermal column. If the ratio, known as the Richardson number, is approximately one, then both forced and natural convection need to be taken into account. © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins The act of convicting; the act of proving, finding, or adjudging, guilty of an offense. The Earth's surface is divided into a number of tectonic plates that are continuously being created and consumed at their opposite plate boundaries. Heavier (denser) components will fall, while lighter (less dense) components rise, leading to bulk fluid movement. G A convection cell, also known as a Bénard cell, is a characteristic fluid flow pattern in many convection systems. The large-scale structure of the atmospheric circulation varies from year to year, but the basic climatological structure remains fairly constant. Represent For example, air on a part of the Earth's surface warmed by strong sunlight will be heated by contact with the ground and will expand and flow upward, creating a region of low pressure below it; cooler surrounding air will then flow in to this low pressure region. The outer edge of the granules is darker due to the cooler descending plasma. If the varying property is a concentration gradient, it is known as solutal convection. Meaning of Conviction. [5] Heat is the entity of interest being advected (carried), and diffused (dispersed). 1 Quality: Not sure. Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition Tamil is also an official spoken language in Sri L anka & Singapore. Although forced convection from thermal gas expansion in zero-g does not fuel a fire as well as natural convection in a gravity field, some types of artificial forced convection are far more efficient than free convection, as they are not limited by natural mechanisms. Published by Houghton Mifflin Harcourt Publishing Company. (eds) Encyclopedic Dictionary of Polymers. In the context of heat and mass transfer, the term "convection" is used to refer to the combined effects of advective and diffusive transfer. plays a significant role as a language in the world today. B. C. D. E. F. Know your HNGs from your FWBs? Heat transfer in a gas or liquid by the circulation of currents from one region to another. Definition of Conviction in the Online Tamil Dictionary. The convection zone of a star is the range of radii in which energy is transported primarily by convection. By continuing to visit this site you agree to our use of cookies. However, flames may be maintained with any type of forced convection (breeze); or (in high oxygen environments in "still" gas environments) entirely from the minimal forced convection that occurs as heat-induced expansion (not buoyancy) of gases allows for ventilation of the flame, as waste gases move outward and cool, and fresh high-oxygen gas moves in to take up the low pressure zones created when flame-exhaust water condenses.[36]. [13] When the moisture condenses, it releases energy known as latent heat of condensation which allows the rising packet of air to cool less than its surrounding air,[14] continuing the cloud's ascension. ≪ Surface tension can vary because of inhomogeneous composition of the substances or the temperature-dependence of surface tension forces. [12] Clouds form as relatively warmer air carrying moisture rises within cooler air. A thermal column (or thermal) is a vertical section of rising air in the lower altitudes of the Earth's atmosphere. The rising part of the granules is located in the center where the plasma is hotter. Convection occurs on a large scale in atmospheres, oceans, planetary mantles, and it provides the mechanism of heat transfer for a large fraction of the outermost interiors of our sun and all stars. Cloud Formation Processes", "The Role of Mountains in the South Asian Monsoon Circulation", 10.1175/1520-0469(1975)032<1515:TROMIT>2.0.CO;2, "Fog And Stratus – Meteorological Physical Background", "A Severe Weather Primer: Questions and Answers about Thunderstorms", National Oceanic and Atmospheric Administration. It stops rising when it has cooled to the same temperature as the surrounding air. This form of heat transfer can be useful for cases where conventional convection fails to provide adequate heat transfer, e.g., in miniature microscale devices or under reduced gravity conditions. Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as wind, oceanic currents, and movements within the Earth's mantle. The subject of convection will be treated of in a future chapter, and would scarcely be understood in this place. Tamil is a very old classical language and has inscriptions from 500 B.C and plays a significant role as a language in the world today. In this process, the water becomes saltier and denser. Similarly, variable composition within the Earth's interior which has not yet achieved maximal stability and minimal energy (in other words, with densest parts deepest) continues to cause a fraction of the convection of fluid rock and molten metal within the Earth's interior (see below). a formal declaration by the verdict of a jury or the decision of a judge in a court of law that someone is guilty of a criminal offence. Mathematically, convection can be described by the convection–diffusion equation, also known as the generic scalar transport equation. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. In the latter case the effect is known as thermo-capillary convection. English. Convective heat transfer is one of the major types of heat transfer, and convection is also a major mode of mass transfer in fluids. This effect can cause liquids to flow against the force of gravity. Longitudinal circulation, on the other hand, comes about because the ocean has a higher specific heat capacity than land (and also thermal conductivity, allowing the heat to penetrate further beneath the surface ) and thereby absorbs and releases more heat, but the temperature changes less than land. For example, a foehn wind is a down-slope wind which occurs on the downwind side of a mountain range. Last Update: 2016-03-10. Tamil Translations of Convention. அவளுடைய நம்பிக்கை அவள் முகத்தில் இருந்தது. What Is The Difference Between “It’s” And “Its”? Granules on the photosphere of the Sun are the visible tops of convection cells in the photosphere, caused by convection of plasma in the photosphere. Convection may happen in fluids at all scales larger than a few atoms. However, the distinction between natural and forced convection is particularly important for convective heat transfer. This brings the sea breeze, air cooled by the water, ashore in the day, and carries the land breeze, air cooled by contact with the ground, out to sea during the night. Information about Convention in the free online Tamil dictionary. However, all types of buoyant convection, including natural convection, do not occur in microgravity environments. (2011) Weissenberg Effect. At the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of subduction at an ocean trench. Convective heat and mass transfer takes place both by diffusion – the random Brownian motion of individual particles in the fluid – and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. ≫ What is the difference between an STR and an LTR? The Marangoni effect is the convection of fluid along an interface between dissimilar substances because of variations in surface tension. All rights reserved. Quantifying natural versus forced convection. Definition of Convention in the Online Tamil Dictionary. Atmospheric circulation is the large-scale movement of air, and is a means by which thermal energy is distributed on the surface of the Earth, together with the much slower (lagged) ocean circulation system.

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