what do you mean by thermosteel
Answers
The term “Thermosteel” is used by ‘Milton' for steel thermoflask.
They are highly insulated flasks and usually keep liquid hot/cold for 10–12hrs. (Milton claims 24 hrs).
To understand it's working, first let us remind modes of heat transfer.
Conduction: Due to collision of molecules and movement of electrons within the body. Heat transfer in solids is due to conduction.
Convection: When a fluid pass by a heated body and carry away some heat along with it. Heat transfer in fluids is due to convection.
Radiation: Due to emission of electromagnetic waves, these waves carry some energy/heat from the emitting object along with them. Radiations passes through vacuum or any transparent medium (solid/liquid)
To create good insulation we have to minimise Heat Transfer Rate.
Thermosteel flasks are made with two layers of steel, surprisingly nothing between them.. not even air.
As there is vacuum between layers, Heat Transfer through conduction and convection becomes Zero. (As conduction and convection need a medium for Heat transfer)
To minimise Heat transfer through radiation, inner and outer layer of the flask are made reflective. It prevents passing of EM waves through boundary(layers of flask).
As reflectivity of the layers is not 100%, so some part of the radiation passes through the layers and causes temperature exchange, but at a very slow rate.
Heat also gets transfer from the lid as there is no vacuum layer in lid, and frequently opening of flask.
The term “Thermosteel” is used by ‘Milton' for steel thermoflask.
They are highly insulated flasks and usually keep liquid hot/cold for 10–12hrs. (Milton claims 24 hrs).
To understand it's working, first let us remind modes of heat transfer.
Conduction: Due to collision of molecules and movement of electrons within the body. Heat transfer in solids is due to conduction.
Convection: When a fluid pass by a heated body and carry away some heat along with it. Heat transfer in fluids is due to convection.
Radiation: Due to emission of electromagnetic waves, these waves carry some energy/heat from the emitting object along with them. Radiations passes through vacuum or any transparent medium (solid/liquid)
To create good insulation we have to minimise Heat Transfer Rate.
Thermosteel flasks are made with two layers of steel, surprisingly nothing between them.. not even air.
As there is vacuum between layers, Heat Transfer through conduction and convection becomes Zero. (As conduction and convection need a medium for Heat transfer)
To minimise Heat transfer through radiation, inner and outer layer of the flask are made reflective. It prevents passing of EM waves through boundary(layers of flask).
As reflectivity of the layers is not 100%, so some part of the radiation passes through the layers and causes temperature exchange, but at a very slow rate.
Heat also gets transfer from the lid as there is no vacuum layer in lid, and frequently opening of flask.
Read more on Brainly.in - https://brainly.in/question/8388708#readmore