An experimental study of forced vibration on natural convection between closed ended concentric and eccentric annular of horizontal cylinder
1
university of technology
2
The University of technology/ Baghdad
3
University of Technology- Iraq
Submission date: 2023-01-01
Final revision date: 2023-04-08
Acceptance date: 2023-05-06
Online publication date: 2023-05-22
Publication date: 2023-05-22
Diagnostyka 2023;24(2):2023112
KEYWORDS
TOPICS
ABSTRACT
An experimental study has been done into the effects of vertical mechanical vibrating, vertical eccentricity, and the Rayleigh number on natural convection heat transferring out of a horizontally enclosed, ending cylindrical annulus with a radius rate of 2.6 and an aspect ratio of (2:1). The annulus produced between two concentric and vertically eccentric circular cylinders is positioned horizontally, and its internal wall is uniformly heated while isothermally cooling the external wall. The range of present conditions for Rayleigh number is 5×〖10〗^4≤Ra≤6.48×〖10〗^6 , and Pr= 0.703, the frequency of vibration is 0f 20Hz; and the amplitude is b mm), with possible exclusion of the highest positive and negative eccentricities. Plots of the average Nusselt number variation against the Rayleigh number showed a significant increase in negative vertical eccentricity. It was found that the average Nusselt decreased as the internal cylinder changed its location vertically from negative to positive through the center, which is normally a desirable effect, but has no advantage over the concentric on the positive side. However, an increase in the Rayleigh number leads to a nearly proportional increase in the average Nusselt number and a smaller yet still substantial increase in positive eccentricity.
REFERENCES (23)
1.
Kuehn TH, Goldstein RJ. An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders. Journal of Fluid Mechanics 1976; 74(4): 695-719. https://doi.org/10.1017/S00221....
2.
Kuehn TH, Goldstein RJ. An experimental study of natural convection in concentric and eccentric horizontal cylindrical annuli. ASME, Journal of Heat Transfer 1978; 100(4): 635-640. https://doi.org/10.1115/1.3450....
3.
Chakrabarti S, Probert SD, Shilton MJ. Optimal eccentric annuli (containing atmospheric-pressure air) for thermally insulating, horizontal, relatively cold pipes. Applied Energy 1983; 14(4): 257-293. https://doi.org/10.1016/0306-2....
4.
Prusa J, Yao LS. Natural convection heat transfer between eccentric horizontal cylinders. ASME, Journal of Heat Transfer 1983; 105(1): 108-116. https://doi.org/10.1115/1.3245....
5.
Habibi MM, Pop I. Natural convection flow and heat transfer in an eccentric annulus filled by copper nanofluid. International Journal of Heat and Mass Transfer 2013; 61: 353–364.
6.
Guj, G. and Stella, F., Natural Convection in Horizontal Eccentric Annuli: Numerical Study, Num. Heat Transfer 1995; 27: 89–105. https://doi.org/10.1016/j.ijhe....
7.
Guj G, Iannetta S, Moretti G. Experimental analysis of thermal fields in horizontal eccentric cylindrical annuli. Experiments in Fluids 1992; 12(6): 385-393. https://doi.org/10.1007/BF0019....
8.
Hosseini R, Heyrani-Nobari MR, Hatam M. An experimental study of heat transfer in an open-ended vertical eccentric annulus with insulated and constant heat flux boundaries. Applied Thermal Engineering 2005; 25(8-9): 1247-1257. https://doi.org/10.1016/j.appl....
9.
Eldesouki IE. Experimental study of free convection in an elliptical annular enclosure in blunt and slender orientation. Heat and Mass Transfer 2010; 47: 81-91. https://doi.org/10.1007/s00231....
10.
Lemlich R, Levy MR. Effect of vibration on natural convection heat transfer. Industrial and Engineering Chemistry 1955; 47: 1175-1180.
11.
Forbes RE, Carley CT, Bell CJ. Vibration effects on convective heat transfer in enclosures. ASME, Journal of Heat Transfer 1970; 92(3): 429-438. https://doi.org/10.1115/1.3449....
12.
Dawood AS, Manocha BL, Ali SMJ. The effect of vertical vibration on natural convection heat transfer from a horizontal cylinder. International Journal of Mass and Heat Transfer 1981; 24(3): 491-496. https://doi.org/10.1016/0017-9....
13.
Kimoto H, Kadotsuji A, Hirose T. Effect of vibration on the natural convection heat transfer of the horizontal cylinder, ASME 1983; 26. https://doi.org/10.1299/JSME19....
14.
Ivanova AA. Influence of vibrations of the unsteady state convective heat transfer in a cylindrical cavity. Heat Transfer-Sov. Res. 1988, 20: 248-251.
15.
Murphy KD, Lambert TA. Model effect on local heat transfer characteristic of vibrating body. ASME Journal of Heat Transfer 2000; 122(2): 233-239. http://dx.doi.org/10.1115/1.52....
16.
Park HG, Gharib M. Experimental study of the heat convection from stationary and oscillating circular cylinder in cross flow, ASME Journal of Heat Transfer 2001; 123: 51-62. https://doi.org/10.1115/1.1338....
17.
Zhang XR, Maruyama S, Sakai S. Numerical investigation of laminar natural convection on a heated vertical plate subjected to a periodic oscillation. International Journal of Heat and Mass Transfer 2004; 47(19): 4439-4448.
18.
Sarhan AR, Karim MR, Kadhim ZK, Naser J. Experimental investigation on the effect of vertical vibration on thermal performances of rectangular flat plate. Experimental Thermal and Fluid Science 2018; 101: 231–240. https://doi.org/10.1016/j.expt....
19.
Venkateshan SP. Mechanical measurements-2015; 346-349 ,2nd edition. Ane Books Pvt. Ltd, India.
20.
Measurement Uncertainty, International Atomic Energ Agency, IAEATECDOC-1585, May, 2008.
21.
Kline SJ, McClintock FA. Describing uncertainties in single sample experiment. Mechanical Engineering 1953; 175: 3-8.
22.
Kline SJ. The purposes of uncertainty analysis. Journal of Fluids Engineering 1985; 107(2): 153-160. https://doi.org/10.1115/1.3242....
23.
Yao LS. Natural convection along a vertical wavy surface, ASME International Journal of Heat and Mass Transfer 1983;105:465–468. https://doi.org/10.1016/j.ijhe....
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