Slit Geometry Effect On The Heat Transfer Process Of Taylor-Couette-Poiseuille Flow

Taylor-Couette-Poiseuille flow has been widely used in various devices such as nuclear main pump,CNC machine tool and so on.The key to deal with many practical problems is to know how the annular structure parameters and the exitence of axial flow affect transition of flow and heat transfer process.It is studied in this text to choose a suitable turbulence model by the method of numerical calculation for the flow field as well as temperature distribution and comparing calculation results with experimental ones.The next to be studied is grid independence verification.In this text,the main content is to know the rule how the annular structure parameters and the exitence of axial flow affect transition of flow and heat transfer process.The areas to be studied include the total annular gap,the area near the inner cylinder and the middle of annular gap.Finally,the rules are obtained how variable affect the flow field under isothermal condition and how variable affect the flow field as well as temperature distribution,shown as followed.1)The existence of axial flow enlarges the axial length of Taylot vortex and aggravate the instability of Taylor vortex pair under isothermal condition.Rotating Reynolds number has the most obvious effect on the distribution of fluid flow field under isothermal conditions.As rotating Reynolds number increases,Taylor-Couette-Poiseuille flow velocity values in various directions as well as the tangential stress of the fluid near the inner cylinder increase significantly.2)Under non-isothermal conditions,the heat transfer performance becomes weaker and weaker when axial Reynolds number increases.The heat flux near the inner cylinder increases first and then decreases with the increase of groove width and groove number.Temperature gradient is the main factor determining the heat transfer performance,and as temperature gradient increases,the heat flux gradually increases,and the increasing speed is very fast.The heat transfer performance has been greatly improved with the increase of rotating Reynolds number.