Abstract
The results of experimental study of evolution of temperature fields under single vapor bubble obtained by high-speed infrared thermometry with high spatial resolution (13 μm) are presented in this paper. The data were obtained at pool boiling of saturated ethanol and deionized water at atmospheric pressure. Reconstruction of local instantaneous heat flux distribution on the heater surface was carried out with the use of numerical simulation. It is shown that maximal local heat flux was observed in the microlayer region on the bubble growth stage and reached the value an order of magnitude greater than the input heat flux. Based on the results of experimental and numerical researches the estimations of the microlayer thickness were carried out at pool boiling of water and ethanol, which are in good agreement with the experimental data presented in the literature and obtained using laser interferometry.
Highlights
Nucleate boiling is common and one of the most effective heat transfer mechanisms, it is widely used in various industrial applications: energy and chemical industry, nuclear power plants, electronics cooling system, etc
A general method to study the evolution of temperature field under single vapor bubble is the high-speed infrared thermometry (IR) [3,4,5,6,7,8,9]
When it deposited onto thin sapphire substrates, which is transparent to both IR and visible spectrum, it became possible to investigate unsteady temperature field of indium tin oxide (ITO) film by infrared recording and to observe the dynamics of vapor bubbles and contact line with the use of high-speed video camera
Summary
Nucleate boiling is common and one of the most effective heat transfer mechanisms, it is widely used in various industrial applications: energy and chemical industry, nuclear power plants, electronics cooling system, etc. A general method to study the evolution of temperature field under single vapor bubble is the high-speed infrared thermometry (IR) [3,4,5,6,7,8,9]. The aim of this research is the experimental investigation of evolution a temperature field under single vapor bubbles using IR method with high temporal (1000 fps) and spatial (13 m) resolutions at pool boiling of water and ethanol at saturation line in wide range of heat fluxes. The second task is to develop numerical algorithm for reconstruction of local instantaneous heat flux distribution on the heater with the use of obtained experimental results of unsteady temperature field
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