18 research outputs found

    The heat transfer crisis in shear driven water film

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    The study of thermocapillary deformation and rupture in horizontal water layer by confocal laser scanning microscopy

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    Π­ΠΊΡΠΏΠ΅Ρ€ΠΈΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½ΠΎ исслСдован эффСкт тСрмокапиллярной Π΄Π΅Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ ΠΈ Ρ€Π°Π·Ρ€Ρ‹Π²Π° Ρ‚ΠΎΠ½ΠΊΠΎΠ³ΠΎ Π³ΠΎΡ€ΠΈΠ·ΠΎΠ½Ρ‚Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ слоя Π²ΠΎΠ΄Ρ‹ Π½Π° сапфировой ΠΏΠΎΠ΄Π»ΠΎΠΆΠΊΠ΅ с Π»ΠΈΠ½Π΅ΠΉΠ½Ρ‹ΠΌ рСзистивным Π½Π°Π³Ρ€Π΅Π²Π°Ρ‚Π΅Π»Π΅ΠΌ ΠΈΠ· оксида индия (Π² Π²ΠΈΠ΄Π΅ Π½Π°ΠΏΡ‹Π»Π΅Π½Π½ΠΎΠΉ Π΄ΠΎΡ€ΠΎΠΆΠΊΠΈ Ρ‚ΠΎΠ»Ρ‰ΠΈΠ½ΠΎΠΉ 0.5 ΠΌΠΊΠΌ, ΡˆΠΈΡ€ΠΈΠ½ΠΎΠΉ 0.5 ΠΈ Π΄Π»ΠΈΠ½ΠΎΠΉ 40 ΠΌΠΌ). Для высокоточных ΠΈΠ·ΠΌΠ΅Ρ€Π΅Π½ΠΈΠΉ Ρ‚ΠΎΠ»Ρ‰ΠΈΠ½Ρ‹ слоя примСнялся Π»Π°Π·Π΅Ρ€Π½Ρ‹ΠΉ ΡΠΊΠ°Π½ΠΈΡ€ΡƒΡŽΡ‰ΠΈΠΉ ΠΊΠΎΠ½Ρ„ΠΎΠΊΠ°Π»ΡŒΠ½Ρ‹ΠΉ микроскоп. УстановлСно, Ρ‡Ρ‚ΠΎ Π³Π»ΡƒΠ±ΠΈΠ½Π° тСрмокапиллярной Π΄Π΅Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ увСличиваСтся прямо ΠΏΡ€ΠΎΠΏΠΎΡ€Ρ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½ΠΎ мощности Π½Π°Π³Ρ€Π΅Π²Π°. Π’Ρ‹Π΄Π²ΠΈΠ½ΡƒΡ‚ΠΎ ΠΏΡ€Π΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅, согласно ΠΊΠΎΡ‚ΠΎΡ€ΠΎΠΌΡƒ Ρ€Π°Π·Ρ€Ρ‹Π² происходит послС Ρ‚ΠΎΠ³ΠΎ, ΠΊΠ°ΠΊ Π² ΡƒΡ‚ΠΎΠ½Ρ‡Π°ΡŽΡ‰Π΅ΠΌΡΡ слоС Тидкости ΠΏΠΎΠ΄ тСрмокапиллярным ΡƒΠ³Π»ΡƒΠ±Π»Π΅Π½ΠΈΠ΅ΠΌ объСмная ΠΏΠ»ΠΎΡ‚Π½ΠΎΡΡ‚ΡŒ Ρ‚Π΅ΠΏΠ»ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΠΎΡ‚ΠΎΠΊΠ° достигаСт ΠΏΠΎΡ€ΠΎΠ³ΠΎΠ²ΠΎΠ³ΠΎ значСния, опрСдСляСмого комплСксом свойств Тидкости ΠΈ ΠΏΠΎΠ΄Π»ΠΎΠΆΠΊΠΈ.The effect of thermocapillary deformation and rupture of a thin horizontal water layer on the sapphire substrate with lineal resistance heater from indic oxide (in the form of deposited path with thickness of 0.5 яm, width of 0.5 mm and length of 40 mm) is experimentally investigated. For high-precision measurements of the layer thickness, the laser scanning confocal microscope is applied. It is found that the depth of the thermocapillary deformation increases directly proportional to the heat capacity. It is suggested that the rapture occurs when in a thinning liquid layer under thermocapillary deepening space density of heat flow reaches a threshold value determined by a complex of liquid and substrate properties

    The influence of microstructured surfaces and liquid pulsations on increasing heat transfer in a minichannel

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    The paper compares two methods for improving the intensification of heat transfer during boiling in a rectangular minichannel. Studies were carried out of the influence of additive structures on the crisis of heat transfer in a minichannel with a two-phase flow, as well as studies of the influence of high-frequency pulsations of liquid flow on the intensification of heat transfer processes during flow boiling

    True-amplitude seismic imaging

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