The purpose of this work is to describe nucleate and transition boiling in a horizontal narrow space between a heated upward-facing copper disk and an unheated surface placed parallel to the heated surface for saturated n-pentane. The narrow space gap varies between 0.2 to 90 mm. A high-speed video camera allows to observe the flow patterns. The heat flux and the wall temperature are determined by mean of an inverse heat conduction method. The influence of the confinement on the boiling curves is analysed. Characteristic instabilities whose frequencies are about 0.01 Hz are observed at low heat flux. They correspond to the onset and the disappearance of boiling within the confined space. During the transition regime, the liquid makes regularly contact with the dry heated surface. The frequency of the phenomenon is close to 15 Hz. Detailed instructions for typing your article are given in the following. Since you have to send a camera-ready paper, you are personally responsible of the quality and appearance of your work.
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