2 June 15, 2015
1. Abbas Salimi Fard, Farshad Farahbod
Investigation of Dynamics of Nano Fluid
European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 52-55.
Number of views: 2484 Download in PDF
2. Farshad Farahbod, Asieh Bahrami, Alison ZamanpourEuropean Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 52-55.
Abstract:
Experimental work is held to investigate how nanoparticle affects the hydrodynamic properties of the fluid. Nano zinc oxide particles with different diameters using different time duration with ultrasonic method are produced. Thermal conductivity enhancement, changes in viscosity, heat capacity, shear rate and density of nanofluid are compared with those in water base fluid.
Experimental work is held to investigate how nanoparticle affects the hydrodynamic properties of the fluid. Nano zinc oxide particles with different diameters using different time duration with ultrasonic method are produced. Thermal conductivity enhancement, changes in viscosity, heat capacity, shear rate and density of nanofluid are compared with those in water base fluid.
Number of views: 2484 Download in PDF
The Effect of Basic Parameters on the Quality of Effluent Waste Water
European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 56-60.
Number of views: 2326 Download in PDF
3. Anastasiya B. KhorunEuropean Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 56-60.
Abstract:
The effect of the shape of impellers on the wastewater treatment process is investigated in this research. Wastewater from the desalination unit of petrochemical industry is used in treatment tanks. Experiments are held with three different types of impellers in the treatment tanks and the amounts of chemical oxygen demands, biological oxygen demands.
The effect of the shape of impellers on the wastewater treatment process is investigated in this research. Wastewater from the desalination unit of petrochemical industry is used in treatment tanks. Experiments are held with three different types of impellers in the treatment tanks and the amounts of chemical oxygen demands, biological oxygen demands.
Number of views: 2326 Download in PDF
On-Line Hydrogenerator Rotor Winding Condition Assessment
European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 61-65.
Number of views: 2230 Download in PDF
4. E.A. Kuznetsova, S.S. MakarovEuropean Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 61-65.
Abstract:
On-line monitoring systems allow assessing the condition of generator stator windings, bearings and the air gap are now widely employed by hydrogenerator plant operators. However, there is no on-line monitor that explicitly determines the condition of the rotor field windings. Although salient pole field windings tend to be very reliable, in each major outage plant personnel spend a considerable amount of time doing the ‘pole drop’ test, to assure themselves that there are no shorted turns on the field poles. In addition, the pole drop test may not be effective in detecting shorted turns in the standstill condition. Investigations have occurred to determine if rotor shorted turns can be detected at lower cost during normal generator operation by measuring the magnetic flux from each pole as it passes a probe that is placed in the air gap. The article presents the results of tests on several hydrogenerators which show that there is some promise in the method.
On-line monitoring systems allow assessing the condition of generator stator windings, bearings and the air gap are now widely employed by hydrogenerator plant operators. However, there is no on-line monitor that explicitly determines the condition of the rotor field windings. Although salient pole field windings tend to be very reliable, in each major outage plant personnel spend a considerable amount of time doing the ‘pole drop’ test, to assure themselves that there are no shorted turns on the field poles. In addition, the pole drop test may not be effective in detecting shorted turns in the standstill condition. Investigations have occurred to determine if rotor shorted turns can be detected at lower cost during normal generator operation by measuring the magnetic flux from each pole as it passes a probe that is placed in the air gap. The article presents the results of tests on several hydrogenerators which show that there is some promise in the method.
Number of views: 2230 Download in PDF
Mathematical Modeling of Dynamics Floating Bell
European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 66-71.
Number of views: 2333 Download in PDF
5. Olga V. LiyasovaEuropean Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 66-71.
Abstract:
The article contains mathematical model and simulation of dynamics of raising the height of the bell from the gas mass flow. The results obtained for the three sizes gazgoderov GM-600 GM-6400 GM-24000. Assuming the law changes the mass flow rate of gas obtained by the functional dependence of the height of the lifting bell on the initial state.
The article contains mathematical model and simulation of dynamics of raising the height of the bell from the gas mass flow. The results obtained for the three sizes gazgoderov GM-600 GM-6400 GM-24000. Assuming the law changes the mass flow rate of gas obtained by the functional dependence of the height of the lifting bell on the initial state.
Number of views: 2333 Download in PDF
Modeling of Diagnostic System for Detectoin Torn-To-Turn Short Sircuits of Rotors Windings Turbogenerator Based on the Analysis of the Signal's by Measurements Standard Transducers
European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 72-78.
Number of views: 2326 Download in PDF
6. L.A. Mihalchenko, S.S. MakarovEuropean Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 72-78.
Abstract:
The new method of short-circuit of coils protection in synchronous generator’s rotor winding is based on the circuit of Pot'e. The mathematical model is developed and researched, allows to determine the number of damaged coils in real time.
The new method of short-circuit of coils protection in synchronous generator’s rotor winding is based on the circuit of Pot'e. The mathematical model is developed and researched, allows to determine the number of damaged coils in real time.
Number of views: 2326 Download in PDF
Mathematical Modeling of Fluid Outflow from the Reservoir
European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 79-85.
Number of views: 2304 Download in PDF
7. N.B. Sigimon, Jose K Jacob, A. SurendranEuropean Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 79-85.
Abstract:
The article contains mathematical model and the simulation results of liquid outflow from the reservoirs at alternating dynamic level. The results obtained for the three sizes of vertical steel tanks – PBC PBC-1000 -5000, -20000 PBC and horizontal tanks, wagon – tanks of 50 m3 and 100 m3 and 150 m3. Obtain a functional dependence of the liquid outflow from the tanks, depending on the diameter of the outlet nozzle. For horizontal tank volume of 50 m3 is given assessment of the impact of the coefficient of flow at the time of expiration.
The article contains mathematical model and the simulation results of liquid outflow from the reservoirs at alternating dynamic level. The results obtained for the three sizes of vertical steel tanks – PBC PBC-1000 -5000, -20000 PBC and horizontal tanks, wagon – tanks of 50 m3 and 100 m3 and 150 m3. Obtain a functional dependence of the liquid outflow from the tanks, depending on the diameter of the outlet nozzle. For horizontal tank volume of 50 m3 is given assessment of the impact of the coefficient of flow at the time of expiration.
Number of views: 2304 Download in PDF
Effect of Engine Oil in the Aftercooler of a 2HA4TERS Horizontally Balanced Opposed Air Compressor
European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 86-94.
Number of views: 2380 Download in PDF
8. European Journal of Technology and Design, 2015, Vol.(8), Is. 2, pp. 86-94.
Abstract:
Thermal designing of an aftercooler typically includes the determination of heat transfer area ,number of tubes, tube length and tube diameter ,tube layout, number of shell and tube passes ,tube pitch, number of baffles, its type and size. CFD model of the after cooler had been developed and it is validated. Unexpected heat is generated at the after cooler of a 2HA4TERS, horizontally balanced opposed air compressor. This causes overheating and burning of the after cooler. This paper aims to determine the effect of variation in oil discharge in to the cylinder of the compressor by analyzing the CFD model of the after cooler. LMTD, Heat flow Q, Weight flow W, Clearance between the tubes C1,Baffle space B, Flow area a, Mass velocity G, Average temperature of the cold fluid ta, Average temperature of the hot fluid Ta, Reynolds number for heat transfer Re, Heat transfer coefficient in general h, for inside fluid hi, and for out side fluid ho, Value of hi when referred to the tube outside diameter hio, Clean overall coefficient of heat transfer Uc, Design overall heat transfer coefficient Ud and dirt factor Rd are determined by using Kerns method.
Thermal designing of an aftercooler typically includes the determination of heat transfer area ,number of tubes, tube length and tube diameter ,tube layout, number of shell and tube passes ,tube pitch, number of baffles, its type and size. CFD model of the after cooler had been developed and it is validated. Unexpected heat is generated at the after cooler of a 2HA4TERS, horizontally balanced opposed air compressor. This causes overheating and burning of the after cooler. This paper aims to determine the effect of variation in oil discharge in to the cylinder of the compressor by analyzing the CFD model of the after cooler. LMTD, Heat flow Q, Weight flow W, Clearance between the tubes C1,Baffle space B, Flow area a, Mass velocity G, Average temperature of the cold fluid ta, Average temperature of the hot fluid Ta, Reynolds number for heat transfer Re, Heat transfer coefficient in general h, for inside fluid hi, and for out side fluid ho, Value of hi when referred to the tube outside diameter hio, Clean overall coefficient of heat transfer Uc, Design overall heat transfer coefficient Ud and dirt factor Rd are determined by using Kerns method.
Number of views: 2380 Download in PDF