Abstract
In order to enhance heat transfer in the abrasive-milling processes to reduce thermal damage, the concept of employing oscillating heat pipes (OHPs) in an abrasive-milling tool is proposed. A single-loop OHP (SLOHP) is positioned on the plane parallel to the rotational axis of the tool. In this case, centrifugal accelerations do not segregate the fluid between the evaporator and condenser. The experimental investigation is conducted to study the effects of centrifugal acceleration (0–738 m/s2), heat flux (9100–31,850 W/m2) and working fluids (methanol, acetone and water) on the thermal performance. Results show that the centrifugal acceleration has a positive influence on the thermal performance of the axial-rotating SLOHP when filled with acetone or methanol. As for water, with the increase of centrifugal acceleration, the heat transfer performance first increases and then decreases. The thermal performance enhances for higher heat flux rises for all the fluids. The flow inside the axial-rotating SLOHP is analyzed by a slow-motion visualization supported by the theoretical analysis. Based on the theoretical analysis, the rotation will increase the resistance for the vapor to penetrate through the liquid slugs to form an annular flow, which is verified by the visualization.
Highlights
During abrasive-milling processes, a large amount of heat is generated in the contact zone between the abrasive-milling tool and workpiece
It is clear that the centrifugal acceleration has a positive influence on the heat transport capacity of the axial-rotating single-loop oscillating heat pipe (OHP) (SLOHP) filled with methanol and acetone
In the range of the centrifugal acceleration from 30 m/s2 to 738 m/s2, the thermal performance enhances for most cases of the axial-rotating SLOHP filled with methanol and acetone
Summary
During abrasive-milling processes, a large amount of heat is generated in the contact zone between the abrasive-milling tool and workpiece. For such a range of rotational speed and centrifugal acceleration, they all found that employing rotational speed was a way to enhance the internal flow, and the centrifugal acceleration has a positive influence on the increase of thermal performance These oscillating heat pipes rotate around the central axis of the tool with the condenser at the centre and the evaporator at the external side. Experimental of the heat transfer and flow the plane parallel to the rotational axis of the tool In this case, centrifugal accelerations do not segregate patterns of “flower-shaped” radial-rotating OHPs were conducted by Aboutalebi et al [25], Ebrahimi theal.fluid the[27]. OHP, whose central axis is aligned to the rotational axis of the tool, is positioned
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