Heat transfer in rotating coolant channels
Abstract
The effect of cooling channels' rotation on the local and mean heat transfer is investigated using an experimental simulation of three types of flow in rotating circular tubes: (1) flow parallel to the rotating axis, (2) radially outward flow perpendicular to the rotating axis, and (3) radially inward flow perpendicular to the rotating axis. Theoretical analysis uses the boundary layer model method, in which the flow in a tube is divided into the core and boundary layer zones with different assumptions for each zone, and the equations are solved using the momentum integration method. Experimental results were obtained using a specially designed facility incorporating all three modes of flow. The results confirm that rotation of the flow in a tube can enhance the heat transfer processes whether the flow is parallel or perpendicular to the rotating axis. The incremental increase in heat transfer rate due to rotation was found to be more pronounced at low rotational speeds than at high speeds. The variation of local heat transfer coefficients along axial direction is affected by the inlet and outlet sections and by the ratio of length to diameter.
- Publication:
-
Rotating Machinery - Transport Phenomena;
- Pub Date:
- 1992
- Bibcode:
- 1992rmtp.proc..313W
- Keywords:
-
- Channel Flow;
- Engine Coolants;
- Heat Transfer;
- High Temperature Gases;
- Rotating Fluids;
- Flow Distribution;
- Gas Turbines;
- Temperature Distribution;
- Fluid Mechanics and Heat Transfer