EXPERIMENTAL STUDY OF HEAT TRANSFER AND FLOW CHARACTERISTICS OF LIQUID FALLING FILM ON A HORIZONTAL FLUTED TUBE | ||||
| ERJ. Engineering Research Journal | ||||
| Article 3, Volume 32, Issue 1, January 2009, Page 21-32 PDF (486.6 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2009.69385 | ||||
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| Author | ||||
| A. M. I. Mohamed | ||||
| Mechanical Power Department, Faculty of Engineering, Suez Canal University, Port-Fuaad, port-Said, Egypt. | ||||
| Abstract | ||||
| The aim of the present study is to investigate experimentally the effect of the fluted surface tube on the heat transfer and flow characteristics ofliquid falling fIlm. Experiments have been indicated that, when a liquid falling film falls on a horizontal fluted surface tube, the transition starts at low Reyno1d~ number than that of the plain tube. The value of the film thickness has been slightly decreased by decreasing the fluted pitch. A reduction ofthe film thickness was observed at about 9% for the low fluted pitch tube, at Reynold’s number of 485. A clear reduction of the dimensionless wavelength, ), has been occuffed at low fluted pitch tube. The use of enhanced surfaces can provide heat coefficients higher than those obtained from plain tube. Heat transfer enhancement was noticed due to the use of fluted tube surface. An improvement of the Nusselt number reached about 45% for low fluted pitch tube. However, the low values ofthe fluted pitch increased the heat transfer enhancement that ofthe high values. | ||||
| Keywords | ||||
| falling film; horizontal tube; Fluid flow; heat transfer enhancement; heat exchangers | ||||
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