HEAT TRANSFER OF THE IMPINGING ROUND WATER JET IN THE INTERFERENCE ZONE OF FILM FLOW ALONG THE WALL.

A round jet of water impinging vertically on a horizontal plane forms a thin film flowing radially which later turns into an ordinary flow after passing through a hydraulic jump region. Hydrodynamic and heat transfer characteristics of two domains of the flow are investigated experimentally. The one domain is the jump region and the other is the interfering films of two equal jets. These two domains have several properties similar to each other because they are both interference zones of two flow regions. The radial location of the interference is found to be an important factor in the hydraulic and thermal properties of the interference region. The film of the jet flow is measured and analysed. It is found that different behaviors of the interference zone are characterized by the film Froude number and the Reynolds number taking the radius from the center of the jet as the representative length.