Abstract: Heat transfer between a surface and an environment, such as a steam/air mixture in a pressure vessel, is determined by directing heat transferred to the surface to a location away from the environment by use of a heat pipe. The heat content of the working fluid of the heat pipe is determined by causing a fluid to flow through a jacket encircling the condensation part of the heat pipe and measuring the mass flow of the fluid and the temperature change. The method is particularly useful in determining heat transfer coefficients for use in safety analysis for pressurized water reactor power stations.

Abstract: In a method of determining the rate of heat transfer from a surface due to liquid convection, a coating of a material capable of dissolving in the convecting liquid and whose optical properties on irradiation are proportional to the thickness of the coating, is applied to the surface and is then exposed to radiation and to the convecting liquid, the change in the amount of radiation transmitted or reflected from the coating giving an indication of the rate of heat transfer.

Abstract: A method of determining the rate of heat transfer from a surface due to fluid convection, in which a sheet of liquid absorbent material, whose transmissive or reflective properties for certain radiations vary with the liquid content, is attached to the surface and, after being wetted with a liquid which will evaporate on passage of the convective fluid, the sheet is exposed to the radiation and to the convecting fluid, and the change in the amount of radiation transmitted through or reflected from the sheet is monitored, this giving a ready indication of the rate of heat transfer.

Abstract: A method and apparatus for detecting magnetic resonance of a sample. The aratus utilizes an exceptionally stable tunnel diode rf oscillator incorporating a LC reentrant cavity resonator. The method entails measuring a magnetic resonance of the sample through the frequency of the oscillator. The resulting dispersion curve can be utilized to obtain the static magnetic susceptibility of the sample. From the value of the static magnetic susceptibility additional parameters may be determined such as material density, temperature or particle spin. The method and apparatus has applications in NMR, NQR and ESR measurements.