Re-engineering the channel heat exchangers(CHEs)is the goal of many recent studies,due to their great importance in the scope of energy transport in various industrial and environmental fields.Changing the internal ge...Re-engineering the channel heat exchangers(CHEs)is the goal of many recent studies,due to their great importance in the scope of energy transport in various industrial and environmental fields.Changing the internal geometry of the CHEs by using extended surfaces,i.e.,VGs(vortex generators),is the most common technique to enhance the efficiency of heat exchangers.This work aims to develop a newdesign of solar collectors to improve the overall energy efficiency.The study presents a new channel design by introducing VGs.The FVM(finite volume method)was adopted as a numerical technique to solve the problem,with the use of Oil/MWCNT(oil/multi-walled carbon nano-tubes)nanofluid to raise the thermal conductivity of the flow field.The study is achieved for a Re number ranging from12×10^(3) to 27×10^(3),while the concentration(φ)of solid particles in the fluid(Oil)is set to 4%.The computational results showed that the hydrothermal characteristics depend strongly on the flow patterns with the presence of VGs within the CHE.Increasing the Oil/MWCNT rates with the presence of VGs generates negative turbulent velocities with high amounts,which promotes the good agitation of nanofluid particles,resulting in enhanced great transfer rates.展开更多
For the sake of saving energy and reducing emissions, this paper will introduce a design of oil-saving device for the simple cylinder 250 water-cooled petrol engine. The oil-saving device is based on the principle of ...For the sake of saving energy and reducing emissions, this paper will introduce a design of oil-saving device for the simple cylinder 250 water-cooled petrol engine. The oil-saving device is based on the principle of heat transfer and capture. By raising the heat of the oil mist up to 50℃, absorption and gathering the released gas from the opening valve, the engine can achieve fuel-saving purpose. The oil-saving device was made by 3D print technology. UG8.0 and ANSYS workbench were used in the design of device.展开更多
基金supported by the Natural Science Foundation of China(Grant Nos.61673169,11301127,11701176,11626101,11601485).
文摘Re-engineering the channel heat exchangers(CHEs)is the goal of many recent studies,due to their great importance in the scope of energy transport in various industrial and environmental fields.Changing the internal geometry of the CHEs by using extended surfaces,i.e.,VGs(vortex generators),is the most common technique to enhance the efficiency of heat exchangers.This work aims to develop a newdesign of solar collectors to improve the overall energy efficiency.The study presents a new channel design by introducing VGs.The FVM(finite volume method)was adopted as a numerical technique to solve the problem,with the use of Oil/MWCNT(oil/multi-walled carbon nano-tubes)nanofluid to raise the thermal conductivity of the flow field.The study is achieved for a Re number ranging from12×10^(3) to 27×10^(3),while the concentration(φ)of solid particles in the fluid(Oil)is set to 4%.The computational results showed that the hydrothermal characteristics depend strongly on the flow patterns with the presence of VGs within the CHE.Increasing the Oil/MWCNT rates with the presence of VGs generates negative turbulent velocities with high amounts,which promotes the good agitation of nanofluid particles,resulting in enhanced great transfer rates.
基金surported by the China Scholarship Council(CSC)(201608525023)
文摘For the sake of saving energy and reducing emissions, this paper will introduce a design of oil-saving device for the simple cylinder 250 water-cooled petrol engine. The oil-saving device is based on the principle of heat transfer and capture. By raising the heat of the oil mist up to 50℃, absorption and gathering the released gas from the opening valve, the engine can achieve fuel-saving purpose. The oil-saving device was made by 3D print technology. UG8.0 and ANSYS workbench were used in the design of device.
