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[PDF] The movement of heat from a warmer object to a colder one
Heat Transfer: The movement of heat from a warmer object to a colder one – when two substances at different temperatures are mixed together, heat flows from
[PDF] 31 & 32 Forms of Heat Transfer & the 2nd Law of Thermodynamics
CONDUCTION – this form of heat transfer requires that two objects be in contact Thermal Energy flows from the w______ object to the c_____ object The
[PDF] Methods of Heat Transfer - Maplesoft
When a temperature difference is present, heat will flow from hot to cold Heat can transfer between two mediums by conduction, convection and radiation
[PDF] Staedy Conduction Heat Transferpdf
The rate of heat transfer between two surfaces is equal to the temperature difference divided by the total thermal resistance between two surfaces
[PDF] Heat Transfer
between objects in proximity, heat transfer between them can never be stopped; it can only be slowed down Energy flow due to temperature difference is
[PDF] Heat Transfer: Conduction, Convection, and Radiation
Any time that two objects or substances touch, the hotter object passes heat to the cooler object (That hot sand passed the heat energy right into my poor
[PDF] Consider two bodies at different temperatures in - UBC Physics
Then internal or thermal energy from the hot body will flow to the cold body The energy transferred is called heat In thermodynamics heat always refers to an
[PDF] Principles of Heat Transfer - WSU Energy Program
energy by controlling radiation heat transfer, grates from the hotter object to the cooler i e , there is nothing between the two surfaces
[PDF] Radiation Heat Transfer Experiment
Radiation heat transfer between the Sun and the Earth As shown in the figure 7 two (or more) surfaces that possess symmetry about a third surface
![[PDF] 31 & 32 Forms of Heat Transfer & the 2nd Law of Thermodynamics](https://pdfprof.com/EN_PDFV2/Docs/PDF_3/127957_33_13_2Heat.pdf.jpg "[PDF] 31 & 32 Forms of Heat Transfer & the 2nd Law of Thermodynamics")
127957_33_13_2Heat.pdf 3.1 & 3.2 Forms of Heat Transfer & the 2nd Law of Thermodynamics
3.1. Explain how heat energy is transferred by convection, conduction, and/or radiation.
Page 479-481 in Text. Section 16.2
3.2. Explain how heat energy will move from a higher temperature to a lower temperature until equilibrium is
reached. Page 482-483 in Text. Section 16.2 to/from Temperature difference temperature Cold warmer Thermal equilibrium equilibrium Conduction Convection Radiation3.1 FORMS OF HEAT TRANSFER
There are three forms of heat transfer. One thing drives heat transfers it is a d________ in t __________.
CONDUCTION - this form of heat transfer requires that two objects be in contact. Thermal Energy flows from the w______ object to the c_____ object. The greater the temperature difference the greater the rate of energy transfer.There is no material flow, only energy flows.
2 requirements for Energy Transfer through Conduction = Physical Contact and
a temperature difference. CONVECTION - this form of heat transfer requires with a fluid which changes density with temperature. In this case the fluid (air) becomes less dense as it is warmed, this density change causes it to rise and cool fluid (air) takes its place. This motion is convection current. Energy is transferred to the air which moves. So the fluid (air) and Energy are moving.2 requirements for Energy Transfer through Convection = Physical Contact
with a fluid and a temperature difference. RADIATION - This is the only form of heat transfer that does not require contact between substances. No contact is required because the energy is transferred as Electromagnetic waves. Specifically the waves are Infrared light. Radiation can transfer energy across space as in the example of the sun heating up the containers.Things that effect rate of heat transfer:
Sight line - Can the objects ͞see" one another͍ Color - Some colors absorb light better than others. Temperature difference - There must be a temperature difference.2 requirements for Energy Transfer through Radiation = Line of sight and a
temperature difference. Forms of Heat Transfer Lesson: If you are absent this is a good source. http://www.wisc-online.com/Objects/ViewObject.aspx?ID=sce304HEAT EXCHANGE- When an object has a h___ er temperature than our body and we touch it we can feel a
difference and energy is transferred ____ our body. When an object has a c___ er temperature than our
body and we touch it we can feel a difference and energy is transferred ____ our body. This leads us to one Method of Stating the Second Law of Thermodynamics:͞Thermal Energy (HEAT) can only flow from objects of hͺͺͺͺͺer temperature to objects of
lͺͺͺͺͺer temperature." THERMAL EQUILIBRIUM - Notice that the only requirement shared by all forms of energy transfer is a t___________ d__________ between the objects. Any time this is present the objects are not at equilibrium. Nature likes equilibrium so the objects will transfer energy until they are at Thermal Equilibrium. Thermal Equilibrium occurs when the two objects have the same t_____________. Look at the two tanks holding water in the diagram. The tanks have equal quantity of water but different ______________.If the valve is opened so water can move from one to another which direction will water flow? To the Left or To the right. Why? The temperature of objects transferring thermal energy is similar to the height of the water in the tanks.When will the water stop flowing?
This diagram illustrates a warm object connected to a cooler object. Which direction will the heat flow?When will heat stop flowing in a thermal system?
In the case of the hot cup
Thermal Energy is transferred
_______ the cup ____ the person͛s hand.In the case of the cold cup
Thermal Energy is transferred
_______ the cup ____ the person͛s hand. Last Name___________________________ First Name______________________ Date___________ Per_____3.1 & 3.2 FORMS OF HEAT TRANSFER
1. What requirement do all forms of heat transfer require? __________________
2. What is it called when two objects have the same temperature? ________________ ________________
3. Which has more thermal energy, a plastic water bottle with hot water (90 C) or the ocean at 15 C?
___________________4. If the plastic bottle of hot water was placed in the ocean which direction would the heat flow? (Choose one and
explain)From the plastic bottle to the ocean or From the ocean to the plastic bottle.
5. Will the ocean͛s temperature change much͍ ͺͺͺͺͺͺͺͺͺͺͺ Why ( or Why not)͍
6. What form of heat transfer is occurring between the hot water bottle and the ocean?
7. When you put your hand in the snow which direction is the heat flowing?
From your hand to the snow or From the snow to your hand.8. A person is baking potatoes tries an experiment. He/she has two identical potatoes. They are placed in the oven
together to be baked. One has a large nail pushed through it. Which potato will heat up more quickly? (Explain your
answer)