Static and dynamic parameters of hot-wire sensors in a wide range of filament diameters as a criterion for optimal sensor selection in measurement process

Abstract

Analysis of velocity and temperature fields in gas flows is an important issue in many areas of modern science and technology. Hot-wire anemometry, besides optical methods, is one of the basic measurement methods used in such analysis. It enables indirect measurement of the gas flow velocity based on measurement of heat losses of hot-wire element placed directly in the studied flow. In this method, selection of optimal measurement sensors, suitable for the metrological issue of interest, is of utmost importance. In this study we present the analysis of static and dynamic parameters of hot-wire sensors in a wide range of filament diameters as a criterion for optimal sensor selection in measurement process. The paper is aimed to serve as a guide, a collection of up-to-date information and values of parameters of sensors determined for a wide range of the filament diameter. Aim of this study is to provide the researchers focused on flow phenomena with the presentation of crucial aspects related to selection of sensors and selected operational parameters of hot-wire anemometric sensors. It will then enable the optimal selection of parameters of used hot-wire anemometric sensors depending on the class of studied flow.