Heat transfer measurements in an enclosed cavity of two corotating disks with axial throughflow were made. The rotating cavity consists of two plane disks and a cylindrical rim (shroud). The ratio of the rim span to the disk outer radius is 0.4 and the ratio of the disk inner to outer radius is 0.25. The results show that the cavity local heat transfer coefficients for both non-rotating and rotating cavity increase with increasing axial flow Reynolds numbers. However, the cavity local heat transfer coefficients decrease with increasing rotational Reynolds numbers at first and then increase with further increasing rotational Reynolds number. The results also indicate that a hotter disk induces more buoyancy driven flow and thus has a higher heat transfer coefficient than a colder disk. The results compare well with the previous investigation.