Development and characterization of a nano-scale temperature sensor (T-NSTAP) for turbulent temperature measurements

摘要: A new nano-scale temperature sensor (T-NSTAP) is presented. The T-NSTAP a sub-miniature, free-standing, platinum wire suspended between silicon supports, designed for measurements at high frequencies. to have bandwidth far superior that of conventional cold-wires, which in combination with its small size, minimizes the effect temporal and spatial filtering on data. Unfiltered data allows unique investigations scalar turbulence, including dissipation range. Temperature were conducted heated grid-turbulence setup, constant mean gradient, compared acquired cold-wire. It shown cold-wire signal significantly attenuated over broad range frequencies, lower attenuation has direct substantial measured variances estimated rate dissipation. observed differences are what predicted by model convincing agreement entire spectrum. close perfect two sensors when corrected end-conduction effects using model. In addition, frequency content analysis probability density function derivative performed comparison T-NSTAP.