Abstract
This work presents a set of experiments concerning the behavior of several types of impellers regarding the depression formatted and operating in a specific range of rotations. Various mixer designs including a four pitched blades impeller, a six flat blades impeller and four two flat blades impeller were compared. Experimental data confirmed the analytical results previously obtained. The results showed that there are similarities regarding the effects generated by four pitched blades impeller and one of the two flat blades impeller. Also, it is found that two shortblade impeller produces the lowest depression of all tested impeller. The maximum depression produced by all type of impellers do not exceeds 120 mmH 2 O at 400 rpm, which is a small value to realize the vaporization of the fluid and to reach the cavitation. The equipment is not in danger to be destroyed. The numerical results obtained by experiments can be used in various practical applications.
Highlights
From extractive and food industry and up to newest industries, like aerospace industry or pharmaceutical, impellers, stirrers or mixers are widely used for homogenization multiphase mixtures, acceleration of chemical reactions or movement of substances through devices and equipment
The problem was studied in [6], the author obtaining a formula that calculates the height of the depression area
In order to obtain supplementary data concerning depression caused by impeller operation, a new set of experimental measurement was made
Summary
From extractive and food industry and up to newest industries, like aerospace industry or pharmaceutical, impellers, stirrers or mixers are widely used for homogenization multiphase mixtures, acceleration of chemical reactions or movement of substances through devices and equipment. Depending on the physical and chemical characteristics of the substances involved in industrial processes, depression which occurs at impellers operation and its dimension are factors with negative potential effects, like slowing of movement, vortices that tend to lower the degree of homogeneity, etc. The authors of this work previously obtained an original analytical solution used to calculate the depression which appears during operation of the impellers. It was obtained the radius variation in the depression area, the pressure inside the depression zone and the depression height [5]. The problem was studied in [6], the author obtaining a formula that calculates the height of the depression area
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