A New Technique for Accurately Measuring Two-Phase Relative Permeability Under Non-Darcy Flow Conditions

The impeller design is the most crucial parameter to enhance the performance of stirred tanks. The cut in the impeller blade is a new technique to save the energy of impellers in mixing vessels without increasing the mixing time or reducing the product quality. In this paper, the new technique of cut is applied for a disc turbine rotating in an unbaffled cylindrical tank. Effects of the V-cut shape are highlighted. Non-Newtonian shear-thinning fluids are considered for the three flow regimes (laminar, transient, and turbulent). Effects of the number of blades on the flow patterns, pumping rate (Nq) and power consumption (Np) are explored. From the obtained results, a recirculation loop of flow is observed at the tip of each blade for impellers with less than three blades. These recirculation loops disappear with the increased number of blades. Under laminar flow conditions, the obtained results also revealed a decrease in power consumption and an increase in the discharge flow rate with the rise of Reynolds number. However, almost any changes were observed for these parameters (Np and Nq) under turbulent flow conditions.

Download Full-text

A NEW TECHNIQUE FOR EVALUATING FLUID-TO-PARTICLE HEAT TRANSFER COEFFICIENTS UNDER TUBE-FLOW CONDITIONS INVOLVING PARTICLE OSCILLATORY MOTION

Journal of Food Process Engineering ◽

10.1111/j.1745-4530.1997.tb00433.x ◽

1997 ◽

Vol 20 (6) ◽

pp. 453-475 ◽

Cited By ~ 5

Author(s):

M.R. ZAREIFARD ◽

H.S. RAMASWAMY

Keyword(s):

Heat Transfer ◽

Oscillatory Motion ◽

New Technique ◽

Tube Flow ◽

Flow Conditions ◽

Transfer Coefficients ◽

Heat Transfer Coefficients ◽

A New Technique

Download Full-text

A New Technique for Preparation of Two-Phase Foam Materials for Controlling Mine Dust and its Application

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.328-330.372 ◽

2011 ◽

Vol 328-330 ◽

pp. 372-375

Author(s):

He Tang Wang ◽

De Ming Wang ◽

Wan Xing Ren

Keyword(s):

Coal Mine ◽

Experimental System ◽

Dust Control ◽

Working Environment ◽

New Technique ◽

Water Spray ◽

Two Phase ◽

Underground Coal Mine ◽

Mine Dust ◽

A New Technique

In order to overcvome the shortage of current dust control technology in coal mine, especially the traditional water spray method, a two-phase foam materials preparation experimental system was established based on the simulation of water and air conditions in underground coal mine. And a new technique which can prepare high-performance foam was proposed, and the main technical parameters and application conditions to implement foam dedusting were determined through plenty of experimental. Then, the new technique had been applied in two large underground coal mine. The results show that its dedusting efficiency to total dust and respirable dust reached 90.5% and 85.4% in the fully-mechanized excavated face, as 1.97 times and 1.88 times higher than water spray respectively. However, its water consumption is only as 10% to 20% as conventional water spray. It is proved that this new technique for preparation of foam can reduce mine dust concentration remarkably and improved the working environment obviously, and has a broad application prospect and promotion value to control dust in underground coal mines and other related industry.

Download Full-text