Pressure Distribution at Impeller Blades of Some Radial Flow Impellers in Saccharose and Xanthan Gum Solutions

Change in liquid temperature behind the impeller blades with impeller speed in boiling stirred tanks

“…They were obtained by fitting the present experimental data. Vlaev et al (2004) found that the pressure distribution for the flat blade is more uniform as compared with that for the circular half-pipe blade. By considering that as can be seen from Eq.…”

“…Lane et al (2001) and Mochizuki et al (2008) experimentally confirmed that the pressure on the front surface of the blade is larger than that on the back surface of the blade and found that the dimensionless pressure difference distribution or pressure coefficient on the front surface of disk turbine blades is in the range from 1.0 to 0. Vlaev et al (2004) predicted local pressure coefficients on the blade surface for three different design impellers using the CFD analysis. The low-pressure region formed behind the impeller blade plays a very important role in nucleation.…”

“…In their study, the experimental data as well as the CFD results indicate that the average value of˛in the centre zone of the front blade surface is around 0.5. Using the CFD analysis, Vlaev et al (2004) found that the ranges of˛for the Rushton turbine and the circular half pipe blade impellers are −1.3 to 0.72 and −0.08 to 0.15 in the centre zone of front blade surface, respectively. In this study, on the basis of the results in the literature (Lane et al, 2001;Mochizuki et al, 2008) we assumed that˛∼ 0.5 and furthermore by considering the results of Mochizuki et al (2008) it is independent on the vapour generation rate as a first approximation.…”

“…In order to predict the local liquid temperature change with impeller speed in boiling stirred tanks, we have developed a simple model on the basis of the results for pressure distribution on the impeller blades in the literature (Tay and Tatterson, 1985;Lane et al, 2001;Vlaev et al, 2004;Mochizuki et al, 2008). We examined the validity of the proposed model using measured local liquid temperatures with dual and triple impeller systems in our previous study (Fukuda et al, 2009).…”

Using Computational Fluid Dynamics To Study the Dynamic Behavior of the Continuous Mixing of Herschel−Bulkley Fluids

“…Computational fluid dynamics (CFD) made the development of such models possible by simulating impeller motion using such methods as multiple reference frames (MRFs) and sliding mesh (SM) . In the mixing of non-Newtonian fluids, CFD has been intensively used to investigate flow fields, − validate the Metzner−Otto concept, − monitor the pressure distribution on the impellers, observe cavern formation, − and measure the mixing time. , …”