RT - Journal Article T1 - Evaluation of the Range of Performance for a Probe Consisting of Two Parallel Hot-Film Cylindrical Sensors in Reverse Flows JF - mdrsjrns YR - 2010 JO - mdrsjrns VO - 10 IS - 3 UR - http://mme.modares.ac.ir/article-15-5962-en.html SP - 57 EP - 66 K1 - Hot wire anemometer K1 - Cylindrical Hot Film Sensor K1 - Reverse flow K1 - Wake K1 - Thermal Effect AB - Hot wire Anemometer (CTA) can be used to measure instantaneous flow velocity with high frequency. Since the principle of opearation of CTA is based on convective cooling, determination of the air flow direction is difficult. In this Research paper, we have used two cylindrical hot-film sensors placed in parallel to determine the flow direction. The wake effect and the heat due to the upstream sensor on the downstream sensor has been used to identity the flow direction. Effect of wake and presence of the upstream sensor on the downstream sensor has been studied. The results have been used to construct a probe consisting of two parallel sensors, sepereated by 1mm distance. Performance of the probe has been evaluated at various flow angles for laminar and turbulant flows. Findings of this study show that this probe provides the best performance at ±10 flow angles. LA eng UL http://mme.modares.ac.ir/article-15-5962-en.html M3 ER -