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Showing papers by "Young I. Cho published in 1981"


Journal ArticleDOI
TL;DR: In this article, thermal conductivity measurements of five non-Newtonian aqueous solutions (Polyethylene Oxide, Polyacrylamide, Carboxymethyl Cellulose, Carbopol-960 and Attagel-40) are in good agreement with the corresponding values for water up to concentrations of 10,000 wppm.

28 citations


Journal ArticleDOI
TL;DR: Experimental results for laminar and turbulent flows in a square duct of 1 cm × 1 cm cross-section and in a capillary tube of 0.1172 cm I.D. are presented for dilute aqueous solutions of polyethylene oxide as discussed by the authors.
Abstract: Experimental friction factor results for laminar and turbulent flows in a square duct of 1 cm × 1 cm cross-section and in a capillary tube of 0.1172 cm I.D. are presented for dilute aqueous solutions of polyethylene oxide (WSR-301). The addition of very small amounts of chemicals such as NaOH, NH 4 OH,H 3 PO 4 ,etc. to the water solvent resulted in significant decreases in the turbulent flow pressure drop in a once-through square duct system. This phenomenon was also observed in a capillary tube, suggesting that the solvent chemistry plays an important role in the friction factor (and inferentially, the heat transfer) performance of aqueous dilute solutions of high molecular weight polymers irrespective of the channel geometry.

9 citations


Journal ArticleDOI
TL;DR: In this article, the mass transfer entry length and maximum mass transfer reduction asymptote for drag-reducing viscoelastic fluids have been calculated analytically using the successive approximation technique.

8 citations