In a recent study published in this journal heat transfer under precessing impinging jets has been investigated using nozzles of two different sizes. It turned out that their heat transfer coefficients are smaller than those for the corresponding steadily impinging inline jets. As an interesting trend, however, they approach those of the inline jets when the nozzle diameter is decreased as shown in Fig. 1. Since in the previous study only two differently sized nozzles have been tested, we now wanted to find out whether this trend prevails, i.e., whether inline jet coefficients are reached and finally exceeded when the size of the nozzles is further decreased.rnIn Section 2, we describe the precessing jet nozzle and how we decrease it in size. A short description of the test facility and the heat transfer plate follows in Section 3. For more details Ref.
展开▼
