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Jitto Varghese
Mechanical Engineer (Project Leader)
 · KeralaIndia
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MILESTONE

Thermal Analysis FEA

Here is the thermal analysis of skin and skin covered with aerogel blanket.
Actually, the analysis is 10 min long and I shortened it into 1 min.
The mesh quality of analysis is very low due to the limitation of my system’s specification.

Conditions
Transient thermal Analysis=10min
Ambient temperture=-40C
Wind speed=70km/hr
Thermal conductivity for skin=0.209 W/mk
Specific Heat=3390 J/kgK
Dencity=1050 kg/m^3
Basal Heat Flow =.0266 W
Heat flow during body shivering =.113W
Thickness of skin =2.5mm
Thickness of aerogel blanket =5mm
Emissivity of skin=0.98
Emissivity of aerogel blanket=.9
Density of aerogel=130 kg/m^3
Thermal conductivity of aerogel=.014W/mk
Specific Heat of aerogel=840 J/kgK

SKIN
Thermal analysis of skin when directly exposed to weather conditions at the mount Everest.

Explanation
Body core temperature is about 37C.And the skin surface temperature is almost the same as core temperature.
And it is important to keep the surface temperature of skin about 37C for the proper blood circulation in the surface of the skin.
In the analysis, we can see that the surface temperature of the skin is dropped to 14.967C within first 60 sec.
From 60 sec to 240 sec body try to increase the surface temperature by muscle contractions known as shivering, by this,
the heat generation is jumped from .0266 W to 0.113W.But still, the surface temperature(27C) is well below 37C.
From 240 sec to 412 sec we can see that surface temperature is dropping to 19C and result in Frostbite.
At the end of the simulation, we can see that the surface temperature is dropped to 14 C result in permanent damage to body tissue or death.

Skin covered with Aerogel Blanket
Thermal analysis of skin when covered with Aerogel at the same weather condition.

Explanation
In this case, the skin is covered with the first layer of insulation (aerogel blanket).Due to very low thermal conductivity of aerogel the heat loss due to conduction and convention are minimized.

From 0 to 600sec there no significant heat loss and the body is able to maintain the temperature 30C with lowest heat generation of .0266 W.

Design
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Jitto Varghese

Thermal FEA of skin 👌

added by:   Harsha Alva
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Bijin Babu
Mechanical Engineer
 · KollamIndia
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Can you explain this jitto

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Jitto Varghese
Mechanical Engineer (Project Leader)
 · KeralaIndia
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Ok bijin I will explain

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Jitto Varghese
Mechanical Engineer (Project Leader)
 · KeralaIndia
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Bijin Babu Please go through updated post

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