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Title: Explosive Vaporization of Water and Isopropyl Alcohol on a Flat Microheater
Authors: Kuznetsov, VV
Kozulin, IA
4th Micro and Nano Flows Conference (MNF2014)
Keywords: Explosive Vaporization;Microheater;Pulse heating;MEMS
Issue Date: 2014
Publisher: Brunel University London
Citation: 4th Micro and Nano Flows Conference, University College London, UK, 7-10 September 2014, Editors CS König, TG Karayiannis and S. Balabani
Series/Report no.: ID 118
Abstract: The MEMS control systems, such as ink jet printers, optical switches and valves, use the explosive vaporization of metastable liquid for the rapid phase change. The initial stage of explosive vaporization of water, isopropyl alcohol and ethanol has been studied experimentally on the surface of a thin-film microheater, covered with the submicron silicon-carbide layer. In experiments, the multilayer thin-film resistor of the Think Jet printhead with 100 × 110 μm2 surface area was used. Applying the optical method, we investigated the patterns of the liquid–vapor phase transition under pulse heating and obtained the characteristics of nucleation at the rate of temperature growth of up to 800 MK/s. Pulsed laser illumination was applied for the high-speed photography of liquid vaporization. Data for the vapor-covered surface area vs. time depending on the supplied heat flux and the heating time are reported. The theoretical model of explosive vaporization on a flat heater has been developed and numerical simulations have been performed for water and isopropyl alcohol nucleation on the multi-layer microheater. Comparison of calculation results with experimental data is discussed in this paper.
Description: This paper was presented at the 4th Micro and Nano Flows Conference (MNF2014), which was held at University College, London, UK. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute, ASME Press, LCN London Centre for Nanotechnology, UCL University College London, UCL Engineering, the International NanoScience Community,
ISBN: 978-1-908549-16-7
Appears in Collections:Brunel Institute for Bioengineering (BIB)
The Brunel Collection

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