Conveying characteristics and resistance characteristics in dense phase pneumatic conveying of rice husk and blendings of rice husk and coal at high pressure

Pneumatic conveying of solids

Critical plug length at the stage of natural plug formation have been experimentally and theoretically obtained by measuring the length and establishing a deformation model of plug flow. As a result, the measured plug length has been in reasonable agreement with the plug length calculated from the model. The plug length were measured on condition that pipeline was 38mm in diameter and 25m long, particles were 1.5mm diameter polythyelene pellets, and the supply particle flow rate was 0.21kg/s. The aim of this study is to obtain the critical plug length by means of an accurate deformation model when a plug generated and transported in a pipeline. The previous studies have mainly focused on pressure loss calculated from a simple plug model that neglects the plug deformation and consists of only one main body. The deformation model considers the generation and development of a plug. Next it considers an accurate plug shape with three parts: front, main body and rear. The generated plug with three parts develops until the critical length by the balance between kniematic energy and energy losses of the particles. The energy losses result from momentum loss caused by accelerating the stationary layer to the plug flow velocity in the front part, and friction drags acting on inter-particles and pipeline inner wall in the main body.

https://www.jstage.jst.go.jp/article/sptj1978/34/6/34_6_405/_pdf

Critical Plug Length at Natural Plug Formation

Dense phase horizontal pneumatic conveying of powder by a Mohno pump

The horizontal pneumatic conveyance of powder was experimentally investigated by using a Mohno pump. The frequency distribution of the plugs, the characteristics of plug velocity, plug length, pressure gradient and solid friction factor were clarified according to the variation in pipe diameter, the speed of pump rotation and air velocity.

Dense Phase Horizontal Pneumatic Conveyance of Powder by a Mohno Pump

Critical velocity of air-solid two-phase flow in a vertical pipe

https://www.jstage.jst.go.jp/article/tetsutohagane1955/77/4/77_4_480/_pdf

Yoshinobu Morikawa

Papers

Dense phase horizontal pneumatic conveying of powder by a Mohno pump

Dense Phase Horizontal Pneumatic Conveyance of Powder by a Mohno Pump

Critical velocity of air-solid two-phase flow in a vertical pipe

Progress of Technology in Powder Transportation: Pneumatic and Hydraulic Conveying@@@空気輸送と水力輸送