TY - JOUR JF - mdrsjrns JO - Modares Mechanical Engineering VL - 10 IS - 3 PY - 2010 Y1 - 2010/12/01 TI - Evaluation of the Range of Performance for a Probe Consisting of Two Parallel Hot-Film Cylindrical Sensors in Reverse Flows TT - بررسی بازه عملکردی پراب دو حسگری فیلم داغ استوانه‌ای موازی در جریان‌های معکوس N2 - 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. SP - 57 EP - 66 AU - Ardekani, M. A. AU - Asghari Tehrani, P. AD - Iranian Organization for Science and Technology (IROST) KW - Hot wire anemometer KW - Cylindrical Hot Film Sensor KW - Reverse flow KW - Wake KW - Thermal Effect UR - http://mme.modares.ac.ir/article-15-5962-en.html ER -