The Experts below are selected from a list of 1962 Experts worldwide ranked by ideXlab platform
Scott H Fogler - One of the best experts on this subject based on the ideXlab platform.
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counterintuitive effects of the Oil Flow Rate on wax deposition
Energy & Fuels, 2012Co-Authors: Yingda Lu, Zhenyu Huang, Rainer Hoffmann, Lene Amundsen, Scott H FoglerAbstract:The experimental trend of a reduced deposit with an increasing Flow Rate has been observed in a series of wax studies. Despite the fact that many previous studies intuitively attribute the reason to the “shear removal”, the role of heat and mass transfer was frequently overlooked as the true explanation. In the current study, the Michigan Wax Predictor (MWP) was applied to elucidate this trend by analyzing the growth Rate of the wax deposit in a series of Flowloop experiments from first principles. The model was able to predict the experimentally observed decrease in deposit thickness with an increasing Oil Flow Rate without any adjustable parameters. It was found that three effects exist to affect wax deposition when the Oil Flow Rate is changed, and each one can either increase or decrease the growth Rate of the deposit. These effects focus on the heat- and mass-transfer phenomena at the Oil–deposit interface. In addition, this study also revealed that the dynamics of the competition between all of thes...
A O Ajayi - One of the best experts on this subject based on the ideXlab platform.
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theoretical prediction of extrusion pressure and Oil Flow Rate during screw expeller processing of palm kernel seeds
Journal of Food Engineering, 1998Co-Authors: T O Omobuwajo, A O AjayiAbstract:A theory is proposed of the physics of Oil expression in a screw press. Deviation of 16 to 27% between the predicted and experimental values of extrusion pressure and Oil Flow Rate indicate that the theory needs further improvement. The theory, however, provides an alternative to costly and time-consuming empirical studies in obtaining information about the performance of a press.
Wenqing Chen - One of the best experts on this subject based on the ideXlab platform.
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Effects of lubricating Oil on the performance of a semi-hermetic twin screw refrigeration compressor
Applied Thermal Engineering, 2017Co-Authors: Xiaokun Wu, Zhilong He, Ziwen Xing, Xiaolin Wang, Wenqing ChenAbstract:Lubricating Oil is often employed in a twin-screw refrigeration compressor for lubricating bearings, sealing leakage paths, cooling refrigerant gas and regulating capacity. In this paper, the effect of lubricating Oil on the performance of a semi-hermetic twin-screw refrigeration compressor is investigated. A mathematical model is established and a comprehensive experimental investigation is performed for this purpose. The model is validated using experimental data and then used to investigate the effect on compressor performance of lubricating Oil supplied to the suction and discharge end bearings, and returned to the suction pipe. The results show that the compressor performance is reduced as the compensation Oil injection Flow Rate increases in the suction pipe. However, as the compensation Oil injection position moves from the suction pipe to a proper compression chamber position, the compressor efficiencies increase as the Oil Flow Rate increases. The results also show that the compressor performance decreases as the Oil Flow Rate increases at the suction end bearing. But the effect on the compressor performance of the lubricating Oil supplied to the discharge end bearing depends on the Oil temperature. Low temperature Oil supplied to the discharge end bearing increases the compressor performance, while high temperature Oil lowers the compressor performance. These analyses provide useful information for optimizing lubricating Oil distribution to maximize energy efficiency in semi-hermetic twin screw refrigeration compressors.
Yingda Lu - One of the best experts on this subject based on the ideXlab platform.
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counterintuitive effects of the Oil Flow Rate on wax deposition
Energy & Fuels, 2012Co-Authors: Yingda Lu, Zhenyu Huang, Rainer Hoffmann, Lene Amundsen, Scott H FoglerAbstract:The experimental trend of a reduced deposit with an increasing Flow Rate has been observed in a series of wax studies. Despite the fact that many previous studies intuitively attribute the reason to the “shear removal”, the role of heat and mass transfer was frequently overlooked as the true explanation. In the current study, the Michigan Wax Predictor (MWP) was applied to elucidate this trend by analyzing the growth Rate of the wax deposit in a series of Flowloop experiments from first principles. The model was able to predict the experimentally observed decrease in deposit thickness with an increasing Oil Flow Rate without any adjustable parameters. It was found that three effects exist to affect wax deposition when the Oil Flow Rate is changed, and each one can either increase or decrease the growth Rate of the deposit. These effects focus on the heat- and mass-transfer phenomena at the Oil–deposit interface. In addition, this study also revealed that the dynamics of the competition between all of thes...
Christophe Diakodimitris - One of the best experts on this subject based on the ideXlab platform.
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Characterisation and optimisation of minimum quantity lubrication in milling of Ti-6Al-4V alloy using phase Doppler anemometry (PDA)
International Journal of Mechatronics and Manufacturing Systems, 2020Co-Authors: Amit Tendolkar, A Damir, Helmi Attia, Patrick Hendrick, Christophe DiakodimitrisAbstract:The main objective of this work is to understand the effect of the MQL parameters; namely, Oil Flow Rate, air Flow Rate and nozzle distance from the cutting zone, on the Flow characteristics in order to optimise the cooling and lubrication capacities of the jet for machining applications. Flow visualisation experiments were performed for different air and Oil Flow Rates and distances from the nozzle using phase Doppler anemometry (PDA). The visualisation results, such as, the droplet size and velocity vector were used to identify the optimum MQL conditions to achieve the desired Flow characteristics for machining applications. It was found that a spray with high air Flow Rate and high Oil Flow Rate would give an axial, symmetrical, coherent, and undisturbed spray, which is characterised by small droplet size and high velocity. This spray is optimum for machining due to its ability for better penetration and cooling effect in the cutting zone. Milling tests were performed on Ti-6Al-4V alloy to validate the effect of MQL parameters on the machining performance, in terms of cutting forces, surface roughness and tool temperature.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
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characterisation and optimisation of minimum quantity lubrication in milling of ti 6al 4v alloy using phase doppler anemometry pda
International Journal of Mechatronics and Manufacturing Systems, 2014Co-Authors: Amit Tendolkar, A Damir, Helmi Attia, Patrick Hendrick, Christophe DiakodimitrisAbstract:The main objective of this work is to understand the effect of the MQL parameters; namely, Oil Flow Rate, air Flow Rate and nozzle distance from the cutting zone, on the Flow characteristics in order to optimise the cooling and lubrication capacities of the jet for machining applications. Flow visualisation experiments were performed for different air and Oil Flow Rates and distances from the nozzle using phase Doppler anemometry (PDA). The visualisation results, such as, the droplet size and velocity vector were used to identify the optimum MQL conditions to achieve the desired Flow characteristics for machining applications. It was found that a spray with high air Flow Rate and high Oil Flow Rate would give an axial, symmetrical, coherent, and undisturbed spray, which is characterised by small droplet size and high velocity. This spray is optimum for machining due to its ability for better penetration and cooling effect in the cutting zone. Milling tests were performed on Ti-6Al-4V alloy to validate the effect of MQL parameters on the machining performance, in terms of cutting forces, surface roughness and tool temperature.
