Effect of surface roughness on wall slip in flow of suspensions

Gülmüş, Sergül Açıkalın


Effects of synthesis and doping methods on thermoluminescence glow curves of manganese doped lithium tetraborate
Kayhan, Mehmet; Yılmaz, Ayşen; Department of Chemistry (2009)
In this study, differences in glow curves of Mn doped LTB powder samples synthesized with solid and wet synthesis methods and doped by using solid and wet doping techniques were investigated. Firstly, LTB was synthesized by using wet synthesis method which mainly comprises dissolution of reactants in water as solvent. Second way to produce LTB which was used in this study was solid synthesis method. In solid synthesis method, reactants were mixed in powder form. In the second part of the study, LTB produced...
Effect of volume fraction and particle size on wall slip in flow of polymeric suspensions
Gulmus, SA; Yılmazer, Ülkü (Wiley, 2005-10-05)
For especially highly concentrated suspensions, slip at the wall is the controlling phenomenon of their rheological behavior. Upon correction for slip at the wall, concentrated suspensions were observed to have non-Newtonian behavior. In this study, to determine the true rheological behavior of model concentrated suspensions, "multiple gap separation method" was applied using a parallel-disk rheometer. The model suspensions studied were polymethyl methacrylate particles having average particle sizes, in the...
Effect of stabilizer on the catalytic activity of Kobalt(0) Nanoclusters catalyst in the hydrolysis of Sodium Borohydride
Koçak, Ebru; Özkar, Saim; Department of Chemistry (2009)
The development of new storage materials will facilitate the use of hydrogen as a major energy carrier in near future. Among the chemical hydrides used as hydrogen storage materials for supplying hydrogen at ambient temperature, sodium borohydride seems to be an ideal one because it is stable under ordinary conditions and liberates hydrogen gas in a safe and controllable way in aqueous solutions. However, self hydrolysis of sodium borohydride is so slow that requires a suitable catalyst. This work aims the ...
Effect of analogy-enhanced instruction accomponied with concept maps on understanding of acid- base concept
Yılmazoğlu, Candan; Yılmazoğlu, Candan; Department of Secondary Science and Mathematics Education (2004)
This study was conducted to explore the effectiveness of analogy-enhanced instruction accompanied with concept maps over traditionally designed chemistry introduction on understanding of acid-base concept and attitude toward chemistry as a school subject. 81 8th grade students from two classes of a chemistry course taught by the same teacher in Nuh Eskiyapan Primary School in Ankara in 2003-2004 fall semesters were enrolled in the study. There were two groups of students. During the treatment, students in t...
Effect of microwave heating on magnetic separation of pyrite
Uslu, T; Atalay, U; Arol, Ali İhsan (Elsevier BV, 2003-09-15)
The effect of microwave heating on magnetic processing of pyrite was investigated. Different size fractions of pyrite were treated (heated) in a microwave oven at 2.45 GHz frequency and different power levels. The microwave treated pyrite samples of -420 mum fraction were subjected to magnetic separation at magnetic field intensities of 0.1, 0.3 and 0.5 T. It was found that pyrite was converted to such ferromagnetic minerals as pyrothite and gamma-hematite, and magnetic separation recovery was improved afte...
Citation Formats
S. A. Gülmüş, “Effect of surface roughness on wall slip in flow of suspensions,” Middle East Technical University, 2002.