Simple modeling COMSOL heat conduction process finishing mug

Vacuum flask model stimulation introduction:

Contents: Built-foam insulation stainless mug containing hot water at 90degC temperature, ambient environment 25 [degC], heat mug within 10 hours distribution changes.

1. Set global parameters;
2. Paint: irregular pattern may be a combination of line segments; for Bezier or polygonal outline, and then converted to [] button to convert the solid line in FIG entity.

1. Setting class boundaries, the boundaries of certain combinations selected out ahead of time. DEFINITIONS method Right - [Select] - [explicit], the interface appears to the right properties, selection entity can be replaced, or the surface, or lines. Such an operation may define the boundary behind the operation more simple and clear.
2. DEFINITIONS Right - [] the thermal properties of the environment, the operation can change the label, the right side of the interface properties may be defined outside temperature, air pressure, humidity and other environmental attributes in advance, this provides a convenient subsequent convection disposed outside the boundary.
3. Add materials:
   1. Regions are numbered as follows: 1 is an insulating foam; 2 is the initial temperature of 90 ° hot water; air 3; 4 is a nylon cap material.
   2. Wherein the inner and outer boundaries of a further need to define a thin layer of metal []. This sheet is defined as a right click operation of the physical field [TLC], and then select the [right] in monolayer sheet or multilayer region in the region COMSOL 4.x version, select thin thermal approximation (Applicable compared with the thermal conductivity in the region near the geometric, more rapid conduction of the case. this case the heat tangent concerned only, ignoring the sheet through the longitudinal heat) , heat or a thickness approximately ( suitable geometric area and the adjacent heat conduction as compared to thermal the guide case is low in this case, we only care about the longitudinal heat transfer, without regard for this option tangential geometry of the multilayer structure). ; and branch material single layer of material [] will appear in response, in which defined layer thickness and material properties can. This difference is not meshing quality thin layer and tangled, and the accuracy of the results is also acceptable.
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4. Adding physical field
   1. First sets an initial value [1], the initial temperature region is the 1,3,4 25 [degC];
   2. Click on general branch physical field [] heat transfer solid, isothermal right below the check field []. This operation is performed for the hot-water region 2 is set to the isothermal region, i.e. the region of temperature change over time, but the temperature is the same everywhere. This can simplify the calculation. After checking the need to add [domain] isothermal operation, after the isothermal add the selected domain 2 region, the default value for the remaining parameters, as follows:
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   3. [2] adding the initial value, the region 2 to the initial value 90 [degC]
   4. [Right] The solid heat transfer - a thin layer (the layer selection - single layer of material; Model layer - thin-wall approximation) - Material branch - single layer of material - to the material thickness of the material to xxmm-: alloy steel. Note that in the choice of a thin layer, thus actually a collection of some of the boundary line, the boundary of the group is defined explicitly in the foregoing [], the moment can come in handy, you can directly choose the drop-down menu
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   5. Thermos with the outside world convective heat transfer heat flux boundary conditions [set]
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      2. Heat flux required is provided with four properties: (1) Select the convective heat flux; (2) the heat transfer coefficient can be defined as himself can choose natural convection outside []; (3) pay attention to this option, upright boundary , heat or transverse boundary is not the same, I [1] is the first heat flux boundary conditions of the bottle, the selection of the vertical wall; (4) a wall height to the total height of the bottle, even if the bottle there arc, not absolute perpendicular to the ground, but here only to consider the total height of the bottle. [2] The same heat flux at heat transfer cap set, so the heat transfer coefficient at the selected [horizontal plate, the upper side]. Fill cap radius length, i.e. the length of the cap zone of symmetry.
   6. Draw the grid
   7. Calculation - we intend to temperature changes in the heat insulating cup 10 hours study, study thus provided in [] at the time [unit] to [h], the time step is to fill [range (0,0.1,10)].
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