Abstract
In order to investigate statistical properties of temperature fluctuation in a boiling two phase boundary layer the corresponding intermittency functions, which describe liquid, vapor and interface region at an individual fixed point, have been defined. In water boiling on a horizontal surface the temperature fluctuation was measured with microthermocouple and the signal was processed through the digital computer with the detector function specified for liquid, vapor and interface region. The results obtained confirm that the temperature fluctuation in the boiling two phase layer can be divided into three parts corresponding to individual regions and that its statistical distribution depends on the properties of respective systems. It has also been shown that the temperature fluctuation in the interface region is determinative and corresponds to the temperature changes in the liquid layer surrounding vapor bubble growth. Amplitude distribution in the liquid region changes its form with the distance from the wall as a result of the change in the intensity of turbulence at different distances. The probability density distribution in the vapor region shows very small amplitude fluctuation and is almost constant for all distances.
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