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Search Results - Convection

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Convection in the most general terms refers to the movement of molecules within fluids (i.e. liquids, gases and rheids). Convection is one of the major modes of heat transfer and mass transfer. In fluids, convective heat and mass transfer take place through both 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. In the context of heat and mass transfer, the term "convection" is used to refer to the sum of advective and diffusive transfer.[1]

A common use of the term convection leaves out the word "heat" but nevertheless refers to heat convection that is, the case in which heat is the entity of interest being advected (carried). In one of two major types of heat convection, the heat may be carried passively by fluid motion which would occur anyway without the heating process (a heat transfer process termed loosely as "forced convection"). In the other major type of heat convection, heating itself may cause the fluid motion (via expansion and buoyancy force), while at the same time also causing heat to be transported by this motion of the fluid (a process known loosely as natural convection, or "free convection"). In the latter case, the problem of heat transport (and related transport of other substances in the fluid due to it) is generally more complicated. Both forced and natural types of heat convection may occur together.

When heat is carried by the circulation of fluids due to buoyancy from density changes induced by heating itself, then the process is known as free or natural convective heat transfer.

Familiar examples are the upward flow of air due to a fire or hot object and the circulation of water in a pot that is heated from below.

Showing 1 to 25 of 32 Articles matching 'Convection' in related articles.
Pages: 1 | 2 | Next >>

1. Space Heaters: Convenient, Energy Efficient and Incredibly Useful
November 21, 2008

Space Heaters are used when main heating system is inadequate or central heating is too costly to install or operate. Space heaters are self-contained, free-standing air heating appliance intended for installation in the space being heated and not intended for duct connection. If you only want to heat one room or supplement inadequate heating in one room, space heaters are less expensive. They can also boost the temperature of rooms used by people who are sensitive to cold without overheating your entire home. Electric space heaters are the only unvented space heaters that are safe to operate ... (read more)

Author: Erin Lynn

2. IS INFRARED RIGHT FOR YOUR PROCESS
November 17, 2008

The top 10 reasons for process improvement or new processes that require some type of heating, drying or curing include: increase in productivity through increase in system line speed, significant reduction in energy costs, decrease in maintenance costs, decrease in downtime, improve product quality thereby reduce rejects and rework, reduction of labor costs, reduction in floor space requirements, new product introduction, change in business owner or management, and/or to keep up with competition. Electric and gas infrared (IR) heat processing is an exciting technology when implemented ... (read more)

Author: David Weisman

3. URBAN MYTHS WITH REGARD TO INFRARED HEATERS AND OVEN SYSTEMS
November 17, 2008

Infrared heat processing is still more of an art today than an exact science. Experience is the key ingredient to successfully conceive and manufacture industrial heating systems to solve a specific set of customer requirements. That said, many urban myths remain concerning the use of infrared heating, drying and curing for industrial processes. First on this list is the requirement of “direct line of sight”. Too many people think direct line of sight is a must for every infrared heating process; that is the infrared source must see every/all portions of a product substrate in order ... (read more)

Author: David Weisman

4. Geothermal Heat Pumps: Cost Effective And Environmentally Sound
October 07, 2008

A Geothermal Heat Pump (GHP)is a device that extracts heat from beneath the ground. It functions based on the fact that heat will flow from higher temperature materials to lower temperature materials by conduction or by convection (air currents). Geothermal pumps absorb energy from the ground or bodies of water to provide space and water heating. This works because the earth absorbs about 50% of the sun's energy that reaches the surface of the planet. Ground source heating and cooling provides high-comfort and cost-effectiveness with an environmentally friendly technology that makes use of ... (read more)

Author: Peggy Loe

5. Diwali Gifts Online In India
September 30, 2008

diwali gifts in india from homeshop18.com and get maximum discount. Brendon Long offers you the latest and best information to buy mobile phones from online shopping in India.">diwali 2008 festival offer – homeshop18 offering diwali 2008 festival offer with big discount and unlimited diwali gifts like wespro digital camera, laxmi gold coin hamper, stainless steel pooja thali, ifb convection mwo free cookbook & dinner set, htc gsm mobile phone. (1). Wespro 5 MP Digital Camera Model No: DS5061s Features: Image Sensor: 5.0 Mega Pixel No. of Images on Internal Memory Interp... (read more)

Author: Brendon long

6. Portable Vaporizer- A Best Friend
September 17, 2008

A best friend in need is a best friend indeed. This is true of a portable vaporizer. For many conditions a portable vaporizer can be a best friend. It acts as an active member in aromatherapy and smoking. There are various types of portable vaporizer be it vapir, digital or any other type. Vapir portable has convection heating system making it a quick and efficient. Its nature of working has made it vary popular and its demand is rising day by day. Among the portable vaporizer the vapir type are available in various shapes and sizes to suit the choices of the customers. For more details variou... (read more)

Author: Francis Adam

7. Microwave Oven: cooking rejuvenated
August 26, 2008

Microwave oven has slowly and gradually become the need of every household today. They are the best when it comes to experience the taste of food. Food has been the necessity of men from the time when the evolution of men happened. But earlier eating food was just a formality as men were totally unknown to the art of cooking. However as the time changed so did the men and its need for food. Today eating food is one of the important activities of a person's daily life. Hence it is very essential for a normal human being to be very careful about his eating habits. It is because a person's e... (read more)

Author: Raisa Raima

8. Microwave Oven: Ease your cooking
August 05, 2008

A microwave oven can simplify your cooking to a great extent. Simply go online and search for the best brands available in the market. Managing your kitchen is a difficult task for most of the homemakers. A common solution to all your cooking needs would be a microwave oven. This device makes sure that the food is completely hygienic. The biggest names in the world of latest microwave ovens are Electrolux and Samsung. They are the most successful and cheap microwave ovens in the present day market. All these devices are of good quality, reliable and affordable. So, if you are searching fo... (read more)

Author: Raisa Raima

9. Microwave Oven: Heat it up!
July 29, 2008

A Microwave oven is a device that is used to cook food by passing electromagnetic radiations through the food substance from all the directions and therefore, ultimately cooking it. The microwave oven can be used to reheat any food substance which is already cooked. The Microwave oven has even counterbalanced itself as a welcome replacement to such cooking applications as the as and electric cooking rages. This device has become the favoured cooking appliance for more and more people today. For people living the fast-paced life, the microwave oven has come a godsend. There are many people... (read more)

Author: Raisa Raima

10. Vapir Vaporizer: - Portable to Carry and Easy To Use
July 14, 2008

An ambient aromatherapy vaporizer is the Vapir. It is also used to deliver flavor. In this vaporizer, a convection method of heating is used to heat the herb and release the active chemicals in the form of the aromatic vapor. This heating element is digitally controlled which has made it ever so popular amongst its user and thus the demand for this vaporizer is increasing day by day. In a true sense, Vapir vaporizer is the only well and truly portable to carry, completely self-contained and easy to use vaporizer. The range of its colors and sizes or design in which it is available is very... (read more)

Author: Francis Adam

11. Extolling the Virtues of an Ultimate Vapir Oxygen Mini
June 27, 2008

The Vapir vaporizer is one of the renowned vaporizers of the world. Its utility and effectiveness have made it the first and undisputed choice of the users. A digitally controlled convection way of heating is used in this vaporizer to heat the herbs. It is the only well and truly portable and completely self-contained vaporizer available on the market place. So many vaporizers by Vapir on the marketplace are there and Vapir Oxygen Mini is one of the ultimate vaporizers in its product line. Beyond any shade of doubt, the Vapir Oxygen Mini has a lot going for it. It is an ultimate vaporize... (read more)

Author: Francis Adam

12. Vapir ONE 5.0: A Complete Makeover and Improvement on the ONE 4.0
June 16, 2008

Vapir Vaporizer is known as the premier handheld and all pervading aromatherapy vaporizer. It is the most affordable air vaporizer which is controlled digitally. To heat the herbs, a convection method of heating is used by this air vaporizer. When the herbs are heated they release the active ingredients. To enjoy exact temperature control, a ceramic housed quartz crystal heating element is featured in this vaporizer. It displays the temperature in both form Celsius or Fahrenheit. This is the only utterly portable, truly self-contained vaporizer available on the marketplace. The Vapir is a... (read more)

Author: Francis Adam

13. Volcano Vaporizer: The Health Promoter and Care Taker
June 14, 2008

Volcano Vaporizers, ?the Mercedes Benz of Vaporizers? needs no introduction even in the least particularly for the smoke lovers. It is one of the most expensive vaporizer if not the most. It gives one an amazing vaporizing experience. In terms of ability to maintain the accurate vaporization temperature, it is the best vaporizer of all. With Volcano vaporizer, one can have optimal flavor and utmost release of active ingredients. Health Promoter: From the technology point of view, it is the most touted vaporizer. It uses convection method of heating the herb. With the help of the ... (read more)

Author: Francis Adam

14. Did you ever wonder about dutch oven cooking over coals?
June 02, 2008

Just like convection cooking a dutch oven is nothing more or less then a cooking pot. It is an iron, most of the times cast iron, thick walled cooking pot that has a lid that is tight fitted. In the past, dutch oven cooking over coals would mean that the whole pot, even the lid, was covered with coals just to make sure that the heat would be all around the pot. When you buy a dutch oven these days it will have legs to hold it above the coals. You will even see that a flange is added to keep the coals out of the food. This type of cooking is a slow and intense process. Roasting A very... (read more)

Author: Kenny Vanderburen

15. Microwave Oven: Smart kitchens can be made overnight!
May 24, 2008

Kitchen management is a tedious task for most of the homemakers. In addition to that, things often get worse when the available time for kitchen management is not in equilibrium with the actual time needed at the kitchen. Most of us try to find alternatives to accommodate our priorities while some of us tend to just give up. The situation is worsened for the users with several choices in lining. Now, let us take an example to illustrate this situation in a clear manner. Suppose, you are a part of a family with 4-5 members and each of the member has different eating habits. Now, this wil... (read more)

Author: Raisa Raima

16. Small Portable Mini Convection Ovens
April 10, 2008

The oven is the heart of a kitchen, the engine in which all foods are cooked, transforming inedible substances into culinary masterpieces. Whilst an oven is nothing short of a latter day alchemy device they tend to be rather slow and ponderous, requiring a great deal of patience on the behalf of the baker. Convection ovens work in precisely the same manner as traditional ovens with major improvement, they make use of heated air which is circulated throughout the oven by means of an electric fan. This seemingly trivial difference with convection ovens actually offers a breakthrough in a ma... (read more)

Author: John Hinkle

17. Convection Heaters
April 10, 2008

convection heaters. Here you can also explore numerous other models of electric convection heaters and gas heaters.">Convection heaters are very effective for maintaining a comfortable warmth in your room. These heaters vary in their size, cost and heating capability. However, all of them are based on the same basic principle. They take in the cold air that surrounds them and warm it up before releasing into the room. Warm air, being lighter, rises up due to buoyancy and the colder air settles down, thus coming closer to the heater. The heater again heats up this air. The cycle continues, and ... (read more)

Author: Nachiketa Mishra

18. Expanding Foam Insulation Benefits for Your Home
February 10, 2008

Home insulation is often thought of in terms of its ability to reduce heating and cooling costs. However, this same ability is only one of the many perks of expanding foam insulation. Expanding foam insulation is applied by spraying it on the desired surface. The foam then expands to fill small spaces in gaps that can cause air to be exchanged between the interior of a home and the outside environment. This prevents air convection from carrying heat between the interior and exterior of a home. In turn, this results in lowering the expense of heating and cooling a house. However, smaller h... (read more)

Author: Andrew Stratton

19. Convection Microwave Oven with good feature
January 28, 2008

A convection microwave oven is a combination of a standard microwave oven and a convection oven. This oven allows the food to be cooked quickly; earlier, these ovens were considered to be high end kitchen appliances as they were more expensive than the conventional microwave. There are lots of microwave ovens for you to choose from, all the different brands have different features and conveniences to offer. Microwave ovens are generally used for time efficiency in both restaurants and at home, while the convection microwave ovens are generally used for cooking a prepared dish. Recently, ... (read more)

Author: Raisa Raima

20. Microwave Ovens: Innovative Models
January 22, 2008

Microwave ovens help in cooking food with remarkable speed. The convection facility in an oven provides a 'airflow' circulation that heats up the food in less time using much less electricity. Cooking in this appliance is a lot faster than conventional methods of cooking as it operates at much lower temperatures. With microwave cooking, nutrient values are preserved and the actual taste of the food remains intact. It also requires a minimum quantity of oil to cook any dish. Food cooked in this appliance is as nutritious as food cooked in other ways, and studies prove that ovens retain mo... (read more)

Author: Alden Jerry

21. Features Of The Cuisinart Bread Machine
January 15, 2008

The chic, brushed stainless steel design coupled with some unique features of the Cuisinart CBK-200 breadmaker make this appliance an attractive purchase. It's a good bread machine but it isn't perfect. The following points may help you decide if it's right for you. The most impressive design feature of the Cuisinart CBK-200 bread maker is the fan convection bake program. Like a conventional oven, air circulates around the dough as it bakes, thereby giving the loaf a more even color with a crispier crust. The convection program is optional, so you don't have to use it every time you bake,... (read more)

Author: Robin OBrien

22. The Cuisinart CBK-200 Bread Machine -Is It Any Good?
December 22, 2007

Overall the Cuisinart bread machine is excellent; it comes with a unique convection bake feature, a beep to let you know that the mixing paddle can be removed before baking and cycles for low-carb, gluten free, and artisan breads. But, it also comes with a few problems. Whether or not you should buy this appliance will depend on you perceiving that the good points out weigh the band ones. The Cuisinart CBK-200 Bread Maker is a convection cooking machine and can make 1, 1.5, or 2 lb loaves of bread and features 16 main cycles: white, rapid white, whole wheat, rapid whole wheat, French/Ital... (read more)

Author: Robin OBrien

23. Choosing the Right Electric Heater
April 19, 2007

Choosing and using the right type of electric heater can keep you both warm and safe. Electric heaters can be an excellent and safe way to keep warm, and they can even help you save energy by allowing you to warm up the room you're in and turn down the heat in the rest of the house. Following a few tips will help you choose the most effective model for your intended use and also use it safely. Portable Heaters versus Fixed Heaters Portable space heaters are a popular addition to many living spaces during the winter months. They're convenient, inexpensive and some are portable f... (read more)

Author: Dale Jones

24. Albert Arfania
March 29, 2007

Albert Arfania The Tropical Weather Discussion for the Caribbean Sea from the National Hurricane Center is below. Albert Arfania Caribbean Sea The Caribbean remains quiet with plenty of dry/stable air. The mid-upper level pattern producing this stable environment consists of an upper ridge centered in the western Caribbean near 17N83W and slight ridging east of the area in the tropical Atlantic. A weakness is above the central Caribbean induced by a weakening trough to the north/northeast. The only area of significant weather is in the extreme southwest Cari... (read more)

Author: Albert Arfania

25. Hailey Fasse
March 29, 2007

Hailey Fasse he Tropical Weather Discussion for the Caribbean Sea from the National Hurricane Center Service is below. Hailey Fasse Caribbean Sea The Caribbean remains quiet with plenty of dry/stable air. The mid-upper level pattern producing this stable environment consists of an upper ridge centered in the western Caribbean near 17N83W and slight ridging east of the area in the tropical Atlantic. A weakness is above the central Caribbean induced by a weakening trough to the north/northeast. The only area of significant weather is in the extreme southwest C... (read more)

Author: Hailey Fasse

Pages: 1 | 2 | Next >>


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