الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Gravity flow has important applications in the grains processing industry and post harvest technology. Gravity pipes are anintegral part of all conveving and handling systems they are relatively cheap, effective and maintenance free.
In egypt most rice and wheat mills are going to expansion in vertical construction and that is because high cost and low availability of ground area. So tend to use vertical and inclined pipes to handling materials.