An Experimental Correlation for Friction Factor in Horizontal Pipe with Trapezoidal Section Inner Longitudinal Slots for Conveying of Solids

Document Type: Research Note

Authors

Department of Farm Machinery, College of Agriculture, Shiraz University, Shiraz, I.R. IRAN

Abstract

In order to increase the efficiency of the conveyance of the granular solids, a new experimental set-up is designed. The test rig has longitudinal trapezoidal slots in its conveying pipes. Through experimentation, a correlation for friction factor in terms of solid mass flow rate, fluid flow rate and Froude number is presented. It is shown that the mixture friction factor for pipes with inner trapezoidal slots is 40% smaller than that of pipes with inner rectangular slots. As a result, the arrangement helps to convey materials to longer distances for a given pressure setting.

Keywords

Main Subjects


[1] Segler G,,Pneumatic Grain Conveying with Special Reference to Agricultural Application”.N.I.A.E.WrestPark. Silsoe. Beds.England (1951).
[2] Marcuse R.D.,Conveying of Solids”, Chapman and Hall.11 New Letter Lang, London (1990).
[3] Happel J., Pressure Drop Due to Vapor Flow Through Moving Beds, Ind. Eng. Chem., 41, p. 1161 (1949).
[4] Berg C.H.O., “Conveyance of Granular Solids”, United States Patent Office, No2684868 (1969).
[5] Koons D.E., Lauer B.E., Continuous Solids Feed, Ind.Eng.Chem., 53, p. 970 (1961).
[6] Wen C.Y., Simons H.P., Flow Characteristics in Horizontal Fluidized Solids Transport, A.I.Ch.E. Journal, p. 263 (1959).
[7] Jafari J., “Characteristics of Dense Phase Pneumatic Transport of Grains in Horizontal Pipes”, Ph.D. Thesis. National Collegeof Agricultural Engineering, Silsoe.UK. 254 P (1976).
[8] Raoufat M.H., Pneumatic Conveying of Grain, A New Approach, International Conference of Agr.Eng., Uppsala, Sweden, Paper No.9201-20 (1992).
[9] Karparvarfard S.H., “Characteristics of Dense Phase Pneumatic Transport of Grains in Horizontal Pipes Having Internal Air Passage Slots”, .Ph.D. Thesis.TarbiatModarresUniversity.Tehran,  (1997)
[10] Torabi A.R., “An Investigation in the Slot Cross Sectional Area Effect in the Pipe for Pneumatic Transportation of Granular Materials”, M.S.Thesis.ShirazUniversity.Shiraz(2000).
[11] British Standards Institute; BS-1042 Pt.1, “Methods for Measurement of Fluid Flow in Pipes, Orifice Plates, Nozzles and Venture Ttubes”, 222 (1964).