scholarly journals Pressure-drop Reduction and Heat-transfer Deterioration of Slush Nitrogen in Square Pipe flow

2015 ◽  
Vol 67 ◽  
pp. 681-686 ◽  
Author(s):  
Katsuhide Ohira ◽  
Kei Nakagomi ◽  
Koichi Takahashi ◽  
Itsuo Aoki
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Pipe Flow ◽  
Heat Transfer Deterioration

Pressure-drop reduction and heat-transfer deterioration of slush nitrogen in horizontal pipe flow

Cryogenics ◽  
2011 ◽  
Vol 51 (10) ◽  
pp. 563-574 ◽  
Author(s):  
Katsuhide Ohira ◽  
Kei Nakagomi ◽  
Norifumi Takahashi
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Pipe Flow ◽  
Horizontal Pipe ◽  
Heat Transfer Deterioration

Pressure drop reduction and heat transfer deterioration of slush nitrogen in triangular and circular pipe flows

Cryogenics ◽  
2017 ◽  
Vol 81 ◽  
pp. 60-75 ◽  
Author(s):  
Katsuhide Ohira ◽  
Kizuku Kurose ◽  
Jun Okuyama ◽  
Yutaro Saito ◽  
Koichi Takahashi
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Circular Pipe ◽  
Heat Transfer Deterioration ◽  
Pipe Flows

Numerical Investigation of Buoyancy Effect on Mixed Convection Heat Transfer Deterioration of Supercritical Pressure Carbon Dioxide

2017 ◽  
Author(s):  
Guoli Tang ◽  
Zhouhang Li ◽  
Yuxin Wu ◽  
Qing Liu ◽  
Junfu Lyu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Mixed Convection ◽  
Pipe Flow ◽  
Convection Heat Transfer ◽  
Supercritical Pressure ◽  
Convection Heat ◽  
Temperature Peak ◽  
Heat Transfer Deterioration ◽  
Mixed Convection Heat Transfer

For supercritical pressure fluid upward pipe flow, turbulent mixed convection heat transfer deterioration, which is generally considered to be caused by buoyancy, is often put a deep concern for safety issues. The deterioration is typically characterized by a localized wall temperature peak. Sometimes, there will be another moderate temperature peak after the first one. However, due to the lack of reliable measure method, the understanding of the flow structure for these two localized temperature peaks were still limited. In order to investigate the detailed mechanism for these two peaks and further understand the effect of buoyancy, a numerical study of supercritical pressure carbon dioxide pipe flow mixed convection heat transfer deterioration was conducted in this paper. The SST k-omega model was selected as turbulence model. A variable turbulent Prandtl number model was adopted in the study to improve simulation accuracy. The variation of flow field and turbulence behavior were carefully analyzed. The results show that, the localized wall temperature rise is due to the suppressed turbulence in the near wall region. For the first localized temperature peak, the suppressed turbulence is due to the acceleration of near wall fluid. While for the second one, the restrained turbulence is due to the acceleration of core flow fluid.

scholarly journals Pressure Drop and Heat Transfer Characteristics of Boiling Nitrogen in Square Pipe flow

2015 ◽  
Vol 67 ◽  
pp. 675-680 ◽  
Author(s):  
Katsuhide Ohira ◽  
Tadashi Nakayama ◽  
Koichi Takahashi ◽  
Hiroaki Kobayashi ◽  
Hideyuki Taguchi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Pipe Flow ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

On Experimental and Computational Investigation of Heat Transfer Deterioration and Hydraulic Resistance in Annular Channel and SCWR 3-Rod Bundle

2018 ◽  
Author(s):  
Vladislav V. Filonov ◽  
Yuliia S. Filonova ◽  
Victor G. Razumovskiy ◽  
Evgeniy N. Pis'mennyi
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Pressure Drop ◽  
Thermal State ◽  
Annular Channel ◽  
Operating Conditions ◽  
Mass Rate ◽  
Heat Transfer Deterioration ◽  
Annular Channels ◽  
Vertical Annuli

The experiments on upward flow of supercritical water in a vertical annuli and 3-rod tight bundle simulator made of 485-mm heated-length tubes of 5.2-mm OD and 4.5-mm ID with four helical ribs of 0.6-mm height, 1-mm width, and axial 400-mm pitch are presented. Heat transfer and pressure drop under various operating conditions (inlet pressure and temperature, flow mass rate and heat flux) were investigated. Longitudinal wall temperature profiles made it possible to determine the place and flow thermal state of heat transfer deterioration (HTD) onset. Analysis of the obtained data (about 200 regimes) proved their good enough agreement with the correlations previously derived by the authors both for the heat flux rate (q/G)b of HTD beginning and for pressure drop in round tubes and annular channels. These correlations were updated to correct the results of their prediction. Computational fluid dynamics and its counterpart computational heat transfer were used for modeling the above-mentioned thermohydraulic processes studied in the first part of the work by finding the most adequate flow turbulence model and optimized domain meshing. The accepted model was benchmarked by some data on heat transfer and pressure drop in tubes and annular channels cooled by SCW.

Paper 40: Superimposed Laminar Forced and Free Convection between Vertical Parallel Plates when One Plate is Uniformly Heated and the Other is Thermally Insulated

1967 ◽  
Vol 182 (8) ◽  
pp. 374-381 ◽  
Author(s):  
T. L. S. Rao ◽  
W. D. Morris
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Pipe Flow ◽  
The Other ◽  
Temperature Fields ◽  
Parallel Plates ◽  
Upward Flow ◽  
Vertical Pipe ◽  
Convection Regime ◽  
Velocity And Temperature Fields

Laminar flow between two vertical parallel plates, with one of the plates uniformly heated and the other thermally insulated, has been studied theoretically for the case where gravitational buoyancy modifies an otherwise forced convection regime. Velocity and temperature fields for two conditions of flow—heated upward flow and cooled upward flow—have been derived. From these results heat transfer and pressure drop data have been calculated and similar tendencies to those which occur in uniformly heated vertical pipe flow were found.

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