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The reactants are generally injected into the industrial furnaces by jets. An effective method to act on combustion in such systems is to control the way injection jets. The present study concerns the control of an air-flow generated through a coaxial burner. The effects of passive control on a turbulent flow were investigated experimentally. The principal idea consists in adding small obstacles on the outlet side of the burner’s annular jet with an aim of increasing the turbulence intensity in the vicinity close to the edge of injection and of having an act on the central flow. The objective of this study consists to study of a swirling flow in a circular pipe and conceiving of a control system significantly improving the mixture on a non-reactive flow in order to apply it to a reactive situation. The various profiles speed for various values of the air-flow injected into the annular tube will be presented in order to propose the effectiveness of our inspecting device in terms of improvement of the mixture between the two jets as well as the mixture with the ambient air. The particle image velocimetry technique has been used to characterize the dynamic field. Results show that the control by adding small obstacles has a considerable effect on the dynamic behavior. [ABSTRACT FROM AUTHOR]

The main idea of this work is to study the effect of knitted fabric characteristics on capillary rise and sorption ability by combining experimental and mathematical approaches. An experimental device performing the vertical suspension of fabric-liquid surface and permitting the penetration of water molecules through the tested samples is used. Experimental values of vertical wicking were gravimetrically measured using an electronic microbalance, and theoretically studied using the linear logarithmic model (LLM). The results show that the theoretical predictions are in reasonable agreement with the experimental data with high correlation coefficients values. It is also demonstrated that capillary rise kinetics are influenced by knitted fabric features, such as composition, knit structure, type of yarn and ofcouliering depth value. Water sorption kinetics of cotton fabrics have also been studied and modeled by using mass measurements of the water absorbed by the textile and the LLM equation in order to interpret the experimental data in terms of sorption ability. [ABSTRACT FROM AUTHOR]