Abstract
An experimental study of a natural convection loop placed in a nearly uniform negative vertical temperature gradient is reported. Distilled water and ethyl alcohol were tested as the working fluid, and two kinds of tori with different tube diameter were used, in order to cover a wide range of Rayleigh numbers as well as to check the one-dimensionality of the flow. The whole flow field was visualized by several standard methods, and was directly measured by means of a laser Doppler anemometer. The critical Rayleigh number, the Rayleigh number dependence of the Reynolds number, and the velocity profile of the quasi-one-dimensional flow along the loop were determined. The three-dimensional cellular structure appears at higher Rayleigh number and shows periodic and nonperiodic change both in space and in time with increase of the Rayleigh number.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
