Quick Answer: What Conditions Are Required For Convective Heat Transfer?

What are the 4 types of heat transfer?

Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling..

What are three types of convection?

Types of ConvectionNatural convection.Forced convection.

Which factors affect heat transfer between a warm and a cool substance?

The amount of time of contact, the area of contact, and the specific heals of the substances, the factors affect heat transfer between a warm and a cool substance. Explanation: Heat transfers from a very hot body always, and into a colder body.

What is a real life example of convection?

This hot water rises and cooler water moves down to replace it, causing a circular motion. radiator – A radiator puts warm air out at the top and draws in cooler air at the bottom. steaming cup of hot tea – The steam you see when drinking a cup of hot tea indicates that heat is being transferred into the air.

What does not involve the movement of matter?

The transfer of heat by radiation involves the carrying of energy from an origin to the space surrounding it. The energy is carried by electromagnetic waves and does not involve the movement or the interaction of matter.

Which refers to the amount of heat required to change the temperature of 1 gram?

Heat will flow from Object 1 to Object 2 in Example 3, and heat will flow from Object 2 to Object 1 in examples 1, 2, and 4. … _________heat is the amount of heat required to change the temperature of 1 gram of a substance by 1°C, and it is related to the chemical composition of the substance.

What conditions are necessary for heat transfer?

The factor or condition that is necessary for heat transfer to occur is that two object ‘must have different temperature’. Heat always flow or move from the hotter object to the cooler one. … Heat Transfer can occur in three ways: Conduction, Convection, and Radiation.

What does convective heat transfer depend on?

The convective heat transfer coefficient is dependent upon the physical properties of the fluid and the physical situation. Values of h have been measured and tabulated for commonly encountered fluids and flow situations.

What factors affect convection?

Spontaneous convection is driven by buoyancy for the most part and surface tension to a lesser extent.exposed surface area.viscosity.density.conductivity (when conductivity is high, there is no need for convection)acceleration due to gravity.

Which indicates that thermal energy is no longer being transferred from boiling water to a mug?

Explanation: The thermal energy is no longer being transferred from boiling water to a mug in the case when water and the mug are at the same temperature. Matter is made up of atoms and molecules which keep moving all the time.

What are 4 examples of convection?

13 Examples Of Convection In Everyday LifeBreeze. The formation of sea and land breeze form the classic examples of convection. … Boiling Water. Convection comes into play while boiling water. … Blood Circulation in Warm-Blooded Mammals. … Air-Conditioner. … Radiator. … Refrigerator. … Hot Air Popper. … Hot Air Balloon.More items…

What is heat transfer coefficient dependent on?

Heat transfer coefficient depends on both the thermal properties of a medium, the hydrodynamic characteristics of its flow, and the hydrodynamic and thermal boundary conditions. … The dependence of the Nu and St numbers on the Re and Pr numbers plays an essential role in heat transfer by forced convection.

What are 4 examples of conduction?

Conduction: Touching a stove and being burned. Ice cooling down your hand. Boiling water by thrusting a red-hot piece of iron into it.

Which best explains Alex’s error?

Alex studied the image shown. He concluded that the image shows thermal energy being transferred from the flames to the person’s hands through conduction. Which best explains Alex’s error? The image does not show conduction because the molecules of two substances or objects are not in direct contact.

What is needed for convection?

Natural convection, or free convection, occurs due to temperature differences which affect the density, and thus relative buoyancy, of the fluid. Heavier (denser) components will fall, while lighter (less dense) components rise, leading to bulk fluid movement.

What are the two conditions for conduction?

Answer: temperature difference between the ends of material (rod or any other form). for conduction between two bodies, the bodies need to be in contact, along with having a temperature difference of course.

What is convection in heat?

Heat convection is a mode of heat transfer by the mass motion of a fluid such as air. Heat convection occurs to the surface of an object where the surrounding fluid of object is heated and moved energy away from the source of heat.

What materials are considered good conductors of heat?

Metals and stone are considered good conductors since they can speedily transfer heat, whereas materials like wood, paper, air, and cloth are poor conductors of heat. These conductive properties are rated based on a “coefficient” which is measured relative to silver.