Abstract
It has been desired to measure pressure distribution in a micro channel for understanding micro-scale thermo-fluid phenomena. Pressure-sensitive paint (PSP) technique is an optical measurement technique using luminescent molecules, seemed to be suitable for analysis of micro/nano flow. However, the spatial resolution of PSP is insufficient for applying to micro-scale measurements due to the aggregation of the luminescent molecules. Therefore, we fabricated pressure-sensitive molecular film (PSMF) by Langmuir-Blodgett (LB) method. LB method can fabricate very thin molecular film with controlling the intermolecular spacing of luminescent molecules. PSMF fabricated by this method has enough high spatial resolution to measure micro-gas flows. The pressure distribution in a micro channel with a bend of 90° was measured by PSMF. The low pressure region was found at near the inner wall behind the bend suggesting the flow separation. Additionally, the high pressure area downstream of the separation region was observed, indicating the flow reattachment.
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