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Heat Transfer
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Absorbed Radiation (SAR value) in a Human Head
The increasing use of wireless equipment has also increased the amount of radiation energy to which human bodies are exposed. A common property that measures absorbed energy is the SAR value, (specific absorption rate) to determine the amount of radiation that human tissue absorbs.
The human head...
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Shell-and-Tube Heat Exchanger
In this model, you will study a part of a shell-and-tube heat exchanger, where hot water enters from above. The cooling medium flows through the tubes that, in this model, impose a constant temperature at the walls. Furthermore, the tubes are assumed to be made of stainless steel and the heat flux i...
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Diesel Engine Piston
In this model, a diesel engine piston is studied at steady-state conditions, that is, at a continuous engine speed and load.
The combustion process at steady-state produces cyclic pressure loads and a high constant temperatures. These load conditions could yield a piston failure due to fatigue crac...
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Free Convection in a Water Glass
This model treats the free convection and heat transfer of a glass of cold water heated to room temperature. Initially, the glass and the water are at 5 °C and are then put on a table in a room at 25 °C.
The nonisothermal flow is coupled to heat transfer using the Heat Transfer module.
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Thermo-Mechanical Analysis of a Surface Mounted Resistor
The drive for miniaturizing electronic devices has resulted in today’s extensive use of surface-mount electronic components.
An important aspect in electronics design and the choice of materials is a product’s durability and lifetime.
For surface-mounted resistors and other components prod...
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Forced Convection Cooling of Horizontal Circuit Board
In this suite of models, temperature distribution and fluid flow field is modeled with the General Heat Transfer and the Non-Isothermal Flow application modes. By modeling the fluid flow and heat transfer simultaneously the convective transfer is described very accurately. The results are analysed a...
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Joule Heating in High-current Battery Clamps in a Circuit
This model analyzes a car battery-charger circuit where the cables and clamps are modeled using the finite element method. They experience high current that results in Joule heating that in turn affects the conductivity of their materials.
Use of the new SPICE Import interface in COMSOL Multiphy...
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Microwave Oven
This is a model of the heating process in a microwave oven. The distributed heat source is computed in a stationary, frequency domain electromagnetic analysis followed. This is followed by a transient heat transfer simulation showing how the heat redistributes in the foodstuff.
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Natural Convection Cooling of a Thermos
The following example solves a free-convection problem in which a thermos holding hot coffee dissipates thermal energy. The main interest is to calculate the thermos’ cooling power, that is, how much heat it loses per unit time.
The example uses General Heat Transfer to solve the heat transfer...
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The Action of Boiling Water from Two Adjacent Nozzles
Boiling flow is an example of phase transition initiated by raising the temperature of a liquid above its saturation temperature. It is possible to accomplish this in many ways; in this example by applying an external heat flux to a solid surface in contact with the liquid.
There are three disti...
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