(96f) Flow-Aided Pneumatic Conveying of Cohesive Dairy Powder

Van den Akker, H. E. A., University of Limerick
Olaleye, A., Dairy Processing Technology Center (DPTC), Bernal Institute, University of Limerick
Walker, G., Bernal Institute, University of Limerick

line-height:normal"> " minion-black>Flow-aided Pneumatic Conveying of Cohesive Dairy Powder

K Olaleye a, Gavin M Walker a, Harry Van den Akker a,

text-align:center;line-height:normal"> font-family:" minion-black>a font-family:" minion-black> The Bernal Institute, University of
Limerick, Limerick, Ireland.

text-align:center;line-height:normal"> font-family:" minion-black>b font-family:" minion-black> Department of Chemical Engineering, Delft
University of Technology, Delft, The Netherlands.

107%;font-family:" minion-black>Abstract

When pneumatically conveying
dairy powders, a mixture of powder and air flows around pipe bends or
experiences any change in flow direction, the milk particles often form a
rope-like structure because of inertial, gravitational and centrifugal effects.
The formation of such particle ropes can lead to stratification,
re-agglomeration, and deposition of cohesive powders in the pipe. The current
study focused on the development of " minion-black> novel, low-cost smart flow-aids that deliver
ultra-low powder deposition and high throughput during cohesive dairy powder
transport. First, several conceptual designs of such smart flow-aids were
investigated in a single bends of varying orientation (i.e. H-V, V-H, and H-H)
by means of a CFD-DEM. The ideas with potential were then tested in a 2-inch
test rig with (i) conventional bends, and (ii) bends modified with the selected
flow-aids (see Figure). In
addition to measurements of pressure drop and powder deposition, an optical
technique was used to measure the dynamics (probability densities) of local
particle volume fractions as a function of operating conditions and conveying
configurations. The
results of the flow-aided and the conventional setup are compared.


Figure: Conventional and Flow-aided
pneumatic conveying setup