10478

9673

كارشناسي ارشد

ساخت و توليد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مكانيك

1394

سيزده، 74ص.: مصور، جدول، نمودار

محمود فرزين، پيمان مصدق

مهدي نيلي احمدآبادي

1394/07/11

محسن بدرسماي، محمدرضا توكلي نژاد

1396/10/04

كتابنامه

مكانيك

مهندسي مكانيك

ID9673

به فارسي و انگليسي

74 Design and Manufacture of a Unidirectional Valve for High Temperature Pressure Non Newtonian Polymeric Materials Navid Taherkhani N Taherkhani@me iut ac ir Date of Submission 2015 08 25 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mohammad Reza Salimpour Salimpour@cc iut ac irAbstractValves are common parts in all industries dependent on the fluid Its duty is cutting or making flow speedor pressure or flow direction control or is a combination of the above Non Newtonian fluids especially polymer fluid has more complex viscosity model The viscosity of thisfluid is not constant not only change with temperature but also change with shear rate inside a duct In this thesis is tried to pass a non Newtonian fluid of molten polymer through a combination check valve Important parameters that are considered in the design of this type of valve include size low pressure drop no parts at zero speed and low speed fluid uniform pressure distribution proper viscosity model uniformtemperature distribution Using equations of rheology valve size was calculated The valve size and shape was optimized bysimulation results Appropriate Drawing was desighned for valve Valve body material selected from steelsstandard 1 6582 To prevent from rust hard chrome plated was used Final testing of valve with PVC polymer was carried out at 200 C At first path 1 tested Material easilypassed this path Then heating elements became off and polymer melt inside the valve solidified AgainExtruder machin turned on and temperature reached 200 C At this stage the material easily passed fromthe first path This test was repeated for the second path Appropriate test results were satisfactory Pressure drop was lower in comparison with simple check valve and it had a good agreement with theresults of mathematical calculations Diameter of 12 mm after optimization had lowest areas of low or zerovelocity All paths had uniform pressure distribution In all points of the model viscosity was simulatedcorrectlly and Viscosity and shear rates distribution was reasonable By use of suitable thermal elements temperature inside the valve was Uniforms Various standards were used to determine characteristics of the combine valve Tests to determine thevalve flow coefficien Cv valve coefficient is valve flow capacity according to US gallons of water perminute at 60 F that passed inside the valve when the pressure drop across the valve is 1 PSI by water andseat leakage test with air compared with simulation results Seat leakage in the range of ISO 5208 standardwas acceptable The results are satisfactory Keywords Combine Valve Non Newtonian fluid pressure drop simulation by Ansys CFX

محمود فرزين، پيمان مصدق

مهدي نيلي احمدآبادي

محسن بدرسماي، محمدرضا توكلي نژاد