Flow of Paper Pulps in Pipe Lines

Abstract

It has been shown further that, although it is possible to obtain good vulcanized products from this polymer without the addition of sulfur, a great increase in the rate of cure and substantial improvement in physical properties of vulcanized products result from the use of as little as 0.5 per cent of sulfur on the weight of the polymer. It is further shown that pine tar and rosin oil may be substituted for rosin but that they are somewhat less efficacious. The authors postulate that the value of rosin, pine tar, and rosin oil is probably due to the organic acids that they contain. Coumarone resin and brown factice are shown to be desirable compounding ingredients for chloroprene polymers.

Flow of Suspensions through Pipes

“…Shishchenko and Baklanov (16) worked with a similar material. Ambrose and Loomis (1) studied the flow of bentonite suspensions through 0.5and 1-inch pipes, and data on the flow of paper pulp and sand suspensions (2, 4,9,11,12,14) have been reported. The viscometry (6,8,10,13,16,19) of suspensions as an approach to the theory of such materials has received more attention.…”

Assessment of Slurry Transport Efficiency after Applying Deflocculant in the Lime Production Process

“…The first report of drag reduction during slurry transport in pipelines in the mining and mineral processing industry dates to the 1950s by Toms (1948), who found that the pressure drop of carrier liquid with the addition of polymers was lower than without it. However, Forrest and Grierson (1931) and Brautlecht and Sethi (1933) discovered that the addition of dilute suspensions can reduce the friction in the pipe when pumping paper pulps. For many years, the phenomenon of pressure drop reduction after the addition of drag reduction agents did not receive much attention from scientists, until the beginning of the 1990s, when Nadolink and Haigh, (1995) summarised the number of publications including journal articles, technical reports, book chapters, and conference papers about drag reduction by additives.…”

A review on drag reduction with special reference to micellar systems

“…The earliest works that recorded a decrease in pressure drop during turbulent flow were undertaken in the thirties [18][19][20] and concerned the transportation of paper pulp. This was, however, not explicitly referred to as a drag reduction phenomenon.…”