International Journal of Chemical Technology1996-34162152-3304Asian Network for Scientific Information10.3923/ijct.2009.11.18A. Abdul BariH.B. Mohd. YunusR.K. MahmoodW.B. HassanZ.1200911The aim of the present investigation was to decline the solubility condition
that number of previous investigation put for any component to be classified
as drag reducing agent. In the present investigation, Sodium Stearate
(SS) with different concentrations (50 to 300 w ppm) was used. The solvent
was used gas oil flowing in three pipe diameters pipelines (0.508, 0.254
and 0.01905 m) and within flow rate range starting from 1.9 to 4.5 m^{3}
h^{-1}. All the experimental work was carried out in a built-up
closed loop liquid circulation system with three testing sections (2 m
long) of the three pipe diameters investigated. The experimental results
showed that, percentage drag reduction (Dr %) increases by increasing
the surfactant concentration and Reynolds number. Also, Dr (%) was found
to increase by decreasing the pipe diameter. The results proved that,
the additive solubility in the transported media is not a condition to
classify the chemical as drag reducing agent. Experimental work correlation
equation was suggested representing the percentage drag reduction as a
function of Reynolds number.]]>Desissler, R.G.,1950Toorman, EA., 2002Hideo, I., H. Naoto and H. Akihiko,2000Inaba, H., K. Ozaki, N. Haruki and H. Asano,1995Lim, S.T., S.J. Park, C.K. Chan and H.J. Choi,2005Mowla, D. and A. Naderi,2006Pereira, A.S. and F.T. Pinho,2002Sher, I. and G. Hetsroni,2008Siriluck, S. and A. Sirivat,2007Ethylene oxide) and cationic surfactant and turbulent wall shear stress in aqueous solution.]]>Usui, H., T. Saeki, T. Takagi and K. Tokuhara,1995Virk, P.S., H.S. Mickley and K.A. Smith,1970Wang, Z.Y., P. Larsen, F. Nestmann and A. Dittrich,1998Yunus, A.C. and J.M. Cimbala,2006Zhu, L. and C.S. Peskin,2007Cho, S.H., C.S. Tae and M. Zaheeruddin, 2007