METHOD OF DETERMINING THERMAL CONDUCTIVITY COEFFICIENT OF SUPER-THIN LIQUID HEAT-INSULATING COATINGS Russian patent published in 2013 - IPC G01N25/18 G01N25/20 

FIELD: physics.

SUBSTANCE: method of determining thermal conductivity coefficient of super-thin liquid heat-insulating coatings involves use of a multilayer plane-parallel wall consisting of two layers of material mounted on a heat source, measuring temperature of the heat source t_T, temperature between two layers of the material t and temperature of the outer surface t_N, and determining λ_u using a calculation formula. Temperature of the non-insulated outer surface of the top layer t_N is calculated as a difference between double the temperature between layers of the material and the temperature of the heat source using the equation: t_N=2t-t_T. A thin metal plate on which there is a super-thin liquid heat-insulating coating is then placed on the outer surface of the top layer. Temperature in the contact surface of the top layer of the material and the metal plate with the heat insulation t_u is measured and the thermal conductivity coefficient of the super-thin liquid heat-insulating coating λ_u is determined using the formula: where: λ_u is the thermal conductivity coefficient of the super-thin heat-insulating coating, δ_u is the thickness of the super-thin heat-insulating coating, δ is the thickness of the layer of the material, λ is the thermal conductivity coefficient of the material, t_N is the temperature of the non-insulated outer surface of the top layer, t_u is the temperature in the contact surface of the top layer of the material and the metal plate with heat insulation. The method enables to measure λ_u in the range from 0.01 to 0.009 W/m°C.

EFFECT: method is simple and affordable.

1 cl, 1 dwg