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Articles by Z. Hassan
Total Records ( 2 ) for Z. Hassan
  H.A. Abdul Bari , E. Suali and Z. Hassan
  In this study, Glycolic Acid Ethoxylate Lauryl Ether (GAELE) anionic surfactant performance as drag reducing agent in aqueous media flow in pipelines was investigated. Testing section length L to pipe diameter D ration (L/D), addive concentration and solution flow rates were the major variables to be investigated in the present study. All the experimental study was carried in a build up experimental rig with three pipe diameters (0.0127, 0.0254 and 0.0381 m inside diameter). The experimental results showed that the (GAELE) anionic can perform as a good drag reducing agent with maximum percentage drag reduction of 73% obtained in 39.37 of L/D for 600 ppm of solution. In 26.24 L/D the highest drag reduction obtained was 53% for 600 ppm of solution. The drag reduction increases corresponding with the increasing of L/D. The setup point where the effect of the drag reducer starts to take action was at Reynolds Number Re of 21000 in L/D equals to 39.37 and at Re = 30000 in 26.24 of L/D. From experimental results, it was shown that the critical wall shear stress occur at Re = 25000 in L/D = 39.37 and at Re = 35000 in L/D = 26.24.
  E. Suali , H.A. Abdul Bari , Z. Hassan and M.M. Rahman
  Power saving is the major reason to study the problem of drag in transporting system. The performance of glycolic acid ethoxylate 4-nonylphenyl ether as drag reducing anionic surfactant was studied experimentally in closed loop circulation system at room temperature. The major investigated variables is operation flow rate which from 11235 to 78645 Re and the solution concentration (ppm), which 200, 300, 400, 500 and 600, respectively. The selected ratio of testing pipe length to diameter (L/D) is equal to 59. The specific conductivity test was conducted to find the CMC of anionic surfactant. It was found that the CMC occurred within the range of 100 to 200 ppm of solution. The maximum drag reduction can be achieved up to 14%. The critical Re was found at 33705 to 56175. The alignment of micelle with the eddies in turbulent flow was identified as the source of drag reduction in pipes.
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