Browsing by Author "10938903300"

Now showing 1 - 3 of 3
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    Publication
    Alternative lubricant based on renewable resources for industrial applications
    (2014)
    Ahmed D.I.
    ;
    Kasolang S.
    ;
    Abu Bakar M.A.
    ;
    Yousif M.H.
    ;
    35753100700
    ;
    10938903300
    ;
    36241411800
    ;
    56232679400
    Bio-lubricants are often touted as a solution but the geographical necessities of cultivation can restrict their practicality as an absolute substitute to petroleum-based lubricants. The development of a novel environmentally-friendly bio-lubricant is the primary focus of this paper. The physico-chemical properties of the bio-lubricant were analyzed using multiple standards tribometers. This study provided sufficient data to conform an ISO VG 68 hydraulic industrial lubricant by blending 52.70% (wt) soybean oil, 40.55% (wt) mineral oil, and 6.75 (%) additive packages. This formulated blend as 'green' alternative for machine lubrications will be significant in reducing perilous environmental pollution and depletion of natural resources. Moreover, it can contribute to reduce the global demand of petroleum based lubricant substantially. © (2014) Trans Tech Publications, Switzerland.
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  • No Thumbnail Available
    Publication
    High speed flow characteristics in gun tunnel
    (Elsevier Ltd, 2012)
    Ahmed D.I.
    ;
    Yusoff M.Z.
    ;
    Amir A.-F.
    ;
    Kasolang S.
    ;
    35753100700
    ;
    7003976733
    ;
    15750212500
    ;
    10938903300
    Research in supersonic remains a concern in many applications and maybe conducted using ground-based experimental facilities, computational fluid dynamics (CFD) or actual flight tests using rocket powered flight vehicles. An experimental study was performed to establish investigative work on the transient flow behaviour in short duration high speed flow gun tunnel test facility available in Universiti Tenaga Nasional (UNITEN). Physical descriptions of the facility along with the principle of operation have been described. The pressure history of flow process was captured using a fast response pressure transducers at three stations located at the end of the facility. Experimental measurements of shock strength, peak pressure and shock wave speed change of Air-Air as a driver/driven gas were presented and compared with another set of experimental measurements using a gas combination of Helium-Air. In this study, deployment of two pressure transducers technique has made measurement of the shock wave speed easy. It was also observed that the existence of the piston has a very significant influence on the moving shock wave and peak pressure value obtained. The results provide a very good estimate of the parameters being investigated after diaphragm rupture and also offer better understanding of the parameters affecting the performance of the facility. � 2012 The Authors.
  • No Thumbnail Available
    Publication
    High speed flow characteristics in gun tunnel
    (2012)
    Ahmed D.I.
    ;
    Yusoff M.Z.
    ;
    Amir A.-F.
    ;
    Kasolang S.
    ;
    35753100700
    ;
    7003976733
    ;
    15750212500
    ;
    10938903300
    An experimental study was performed to establish investigation on the transient flow in short duration high speed flow gun tunnel test facility available in Universiti Tenaga Nasional (UNITEN). Physical description of the facility along with the principle of operation is described. The pressure history of flow process was captured using fast response pressure transducer at three stations located at the end of the facility. Experimental measurements of shock strength, peak pressure and shock wave speed change of Air-Air as a driver/driven gas are then presented and compared with another set of experimental measurements using gas combination of Helium-Air. Shock wave speed now can be measured experimentally with the two pressure transducers technique easily. The existence of the piston has a very significant influence on the moving shock wave and peak pressure value achieved. The results provide very good estimate for the above mentioned parameters obtained after diaphragm rupture and also provide better understanding of the parameters that affect the performance of the facility. � 2012 American Institute of Physics.
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