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MECH466-Lecture-9

# MECH466-Lecture-9 - MECH 466 Systems University of Victoria...

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1 MECH 466 Microelectromechanical Systems University of Victoria Dept. of Mechanical Engineering Lecture 9: June 7th, 2007 Mech 466, N. Dechev, UVic 2 Example of Heat Transfer when Boiling Water Modeling Heat Transfer as ‘thermal circuits’ Thermal Energy Storage Heating and Cooling Rates Example of Heat Rise Time in a Polysilicon Beam Thermal Sensors and Actuators Overview Mech 466, N. Dechev, UVic

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Consider the Diagram below: 3 Example of Heat Transfer: Boiling Pot of Water Mech 466, N. Dechev, UVic Conduction in Pot from Bottom Edge to Top Edge 1 Convection from Solid Pot into Liquid 2 Convection from Liquid to Air 3 Convection from Solid Pot to Air 4 Radiation 5 4 The “driving force” for heat flow is temperature difference - i.e. Heat will only flow from one point to another if there is a temperature difference between these two points. - Heat will only flow from High Temp ---> Low Temp. A useful analogy between heat (thermal) and current (electrical) is: Mech 466, N. Dechev, UVic Heat Transfer Thermal Domain Electrical Domain heat flux, current, Temp Differ., Potential Difference, Thermal Resistance, Resistance,
5 For the boiling pot example, the ‘overall’ driving force is:

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MECH466-Lecture-9 - MECH 466 Systems University of Victoria...

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