Experimental study of regimes of low-velocity motion of a subheated liquid in horizontal annular channels with a heat-transfer crisis

1986 ◽  
Vol 50 (2) ◽  
pp. 151-154 ◽  
Author(s):  
Yu. D. Kozhelupenko ◽  
A. P. Mirgorodskaya
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Low Velocity ◽  
Heat Transfer Crisis ◽  
Annular Channels ◽  
Velocity Motion

Experimental study of a heat transfer crisis

1964 ◽  
Vol 16 (5) ◽  
pp. 515-521 ◽  
Author(s):  
V. N. Smolin ◽  
V. K. Polyakov ◽  
V. I. Esikov
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Transfer Crisis

An Experimental Study of Forced Heat Convection in Concentric and Eccentric Annular Channels

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
N. Kline ◽  
S. Tavoularis
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Mixed Convection ◽  
Reynolds Numbers ◽  
Diameter Ratio ◽  
Outer Diameter ◽  
Narrow Gap ◽  
Convection Regime ◽  
Annular Channels ◽  
Internal Surfaces

An experimental study of the effect of eccentricity on forced convective heat transfer was conducted for upward flows in vertical, open-ended annular channels with a diameter ratio of 0.61, a length to outer diameter ratio of 18:1, and both internal surfaces heated uniformly. Flows with Reynolds numbers Re = 5450, 10,000, and 27,500 and eccentricities varying from 0 to 0.9 were examined. These results are deemed to be mostly in the forced convection regime with some possible overlap with the mixed convection regime at the lowest Reynolds number considered. This work complements our previous work on natural and mixed convection using the same facility. The effect of eccentricity was not significant at lower eccentricities, but, in highly eccentric cases, the wall temperature in the narrow gap was much higher than in the wide gap and the average heat transfer coefficient was as low as one-fifth of the concentric value. For Re > 10,000, the average Nusselt number for the concentric case was nearly four times higher than the value predicted by the Dittus–Boelter correlation.

Experimental study of heat transfer crisis with nitrogen boiling in a vertical channel

1993 ◽  
Vol 7 (2) ◽  
pp. 160
Author(s):  
A.V. Klimenko ◽  
V.V. Klimenko ◽  
A.M. Sudarchikov ◽  
K. Yu Tarasov ◽  
O.I. Morozov
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Vertical Channel ◽  
Heat Transfer Crisis

Experimental study of thermohydraulic characteristics and irreversibility analysis of novel axial corrugated tube with spring tape inserts

2020 ◽  
Vol 92 (3) ◽  
pp. 30901
Author(s):  
Suvanjan Bhattacharyya ◽  
Debraj Sarkar ◽  
Ulavathi Shettar Mahabaleshwar ◽  
Manoj K. Soni ◽  
M. Mohanraj
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Thermal Performance ◽  
Working Fluid ◽  
The Novel ◽  
Heat Exchanger Tube ◽  
Heat Transfer Augmentation ◽  
Corrugated Tube ◽  
The Impact ◽  
Exchanger Tube

The current study experimentally investigates the heat transfer augmentation on the novel axial corrugated heat exchanger tube in which the spring tape is introduced. Air (Pr = 0.707) is used as a working fluid. In order to augment the thermohydraulic performance, a corrugated tube with inserts is offered. The experimental study is further extended by varying the important parameters like spring ratio (y = 1.5, 2.0, 2.5) and Reynolds number (Re = 10 000–52 000). The angular pitch between the two neighboring corrugations and the angle of the corrugation is kept constant through the experiments at β = 1200 and α = 600 respectively, while two different corrugations heights (h) are analyzed. While increasing the corrugation height and decreasing the spring ratio, the impact of the swirling effect improves the thermal performance of the system. The maximum thermal performance is obtained when the corrugation height is h = 0.2 and spring ratio y = 1.5. Eventually, correlations for predicting friction factor (f) and Nusselt number (Nu) are developed.

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