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Register a new userEstimate values of Bulk modulus at effect of pressure and temperature for mineral oil SAE 46 which it is used in hydraulic systems
استنتاج قيم (Bulk modulus) عمليا بمؤثري الضغط و درجة الحرارة للزيت المعدني SAE 46 المستخدم في المنظومات الهيدروليكية
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صممت و ركبت منظومة بغرض استنتاج قيم لمعامل بلك (Bulk modulus) ضمن حدود للضغط من 20 bar إلى 230 bar و بدرجات حرارة تراوح بين 5° Cو 90° C و هذه الحدود هي المدى الأوسع الذي تعمل عليه المنظومات الهيدروليكية. سخن في هذا البحث الزيت المعدني 46 SAE (بطريقة غير مباشرة) ثم ضغط إلى أنبوب ذي سمك كبير مقارنة بالقطر الداخلي و ذلك لضمان عدم تأثر القراءات بمرونة الأنبوب، سجلت قراءات الخصائص، الضغط و درجة الحرارة بواسطة مقاييس مثبتة على خط الجهاز في حين أخذت قراءات الانضغاطية بوساطة أنبوب مدرج. استنتج أن درجة حرارة الزيت المعدني لها تأثير فعال في قيم معامل (Bulk) حتى عند درجات الحرارة الأقل من 50° C، و أن ارتفاع الميل (لمنحنيات العلاقة بين معامل بلك مع ارتفاع الضغط) انخفض مع زيادة درجة الحرارة. كذلك استنتج تذبذب قيم معامل بلك عند الضغوط أقل 100 bar من درجات الحرارة لهذا الزيت المعدني.
Hydraulic system was designed and installed to estimate values of Bulk modulus within the range of pressure between 20 bar to 230 bar and temperature between 5° C to 90° C; these limits are the widest range in which it operates hydraulic systems . In this research the mineral oil (SAE 46) is heated (indirectly method) and then pressed into a pipe with large thickness compared with internal diameter so as to ensure that the results will not be affected by the elasticity of the pipe material. The results for the characteristics‚the pressure and temperature have been indicated by gages installed on the line of hydraulic circuit while taking readings compressibility through indicator tube. It was concluded that the temperature of mineral oil have an effective impact on the Bulk modulus values even at lower temperatures lower than 50° C and the sloop (of the relation curve between Bulk modulus and pressure) is reduced with temperature increase. it was also estimated that values of Bulk modulus are volatileat pressures less than 100 bar with increasing temperatures for this mineral oil.
References used
The Engineering Toolbox www. Enginering ToolBoox.com
Core Laboratories ( U.K.) “Hydraulic Fluid Study for Niche Product Limited Pelagic 100 Production Control Fluid” RFLA 20020227 6th September 2002
Karl E. R. “Energy efficient water hydraulic systems” Linkoping University , Sweden 2000
Darko K. , Vladimir S. “Mathematical modules of changing of dynamic viscosity , as a function of temperature and pressure , of mineral oils for hydraulic systems”Received April 10 2006
Lari Kela and PekkaVahaoj“Measuring pressure wave velocity in ahydraulic system” Word academy of science, Engineering and Technology 2009
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