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B M Burnside - One of the best experts on this subject based on the ideXlab platform.

  • Pressure drop measurements in a low Pressure Steam condenser with a horizontal bundle of staggered tubes
    Applied Thermal Engineering, 2004
    Co-Authors: Bodius Salam, David Archibald Mcneil, B M Burnside
    Abstract:

    Abstract Pressure drop measurements were carried out in a test condenser of staggered configuration with p/D=1.33. The test conditions were: Steam Inlet Pressure, 50 mbar, Inlet velocity 10–30 m s−1 and Steam-to-cooling water temperature difference 5–15 K. This corresponded to a mean bundle Rev,max between 1000 and 7000, suction parameter range 0.3–2.8 and heat flux densities at the tube outside wall up to 79 kW m−2. In the range 2800 The results reported here suggest that considerable errors in Pressure drop, with consequent errors in heat transfer distribution, can result from ignoring the effect of suction as is currently done in condenser design and prediction.

  • Pressure drop measurements in a low Pressure Steam condenser with a horizontal bundle of staggered tubes
    Applied Thermal Engineering, 2004
    Co-Authors: Bodius Salam, David Archibald Mcneil, B M Burnside
    Abstract:

    Pressure drop measurements were carried out in a test condenser of staggered configuration with p/D = 1.33. The test conditions were: Steam Inlet Pressure, 50 mbar, Inlet velocity 10-30 m s -1 and Steam-to-cooling water temperature difference 5-15 K. This corresponded to a mean bundle Re v,max between 1000 and 7000, suction parameter range 0.3-2.8 and heat flux densities at the tube outside wall up to 79 kW m -2 . In the range 2800 < Re v,max < 6400 increase in condensation rate progressively reduced the Pressure drop coefficient to a minimum of 27-30% of the corresponding dry flow at Re v,max = 2840 and 5320 as predicted by ESDU 74040. The results were compared with previous investigations and condensing Pressure drops found comparable with Nicol et al. [Proc. 7th Int. Heat Transfer Conf. 5 (1982) 133-138] but the Fujii et al. [Int. J. Heat Mass Transfer 15 (1972) 247-260] Pressure drops were always found to be lower by up to 52% than the present data. The flow patterns associated with the effect of condensation on Pressure drop are discussed. The results reported here suggest that considerable errors in Pressure drop, with consequent errors in heat transfer distribution, can result from ignoring the effect of suction as is currently done in condenser design and prediction.

Bodius Salam - One of the best experts on this subject based on the ideXlab platform.

  • Pressure drop measurements in a low Pressure Steam condenser with a horizontal bundle of staggered tubes
    Applied Thermal Engineering, 2004
    Co-Authors: Bodius Salam, David Archibald Mcneil, B M Burnside
    Abstract:

    Abstract Pressure drop measurements were carried out in a test condenser of staggered configuration with p/D=1.33. The test conditions were: Steam Inlet Pressure, 50 mbar, Inlet velocity 10–30 m s−1 and Steam-to-cooling water temperature difference 5–15 K. This corresponded to a mean bundle Rev,max between 1000 and 7000, suction parameter range 0.3–2.8 and heat flux densities at the tube outside wall up to 79 kW m−2. In the range 2800 The results reported here suggest that considerable errors in Pressure drop, with consequent errors in heat transfer distribution, can result from ignoring the effect of suction as is currently done in condenser design and prediction.

  • Pressure drop measurements in a low Pressure Steam condenser with a horizontal bundle of staggered tubes
    Applied Thermal Engineering, 2004
    Co-Authors: Bodius Salam, David Archibald Mcneil, B M Burnside
    Abstract:

    Pressure drop measurements were carried out in a test condenser of staggered configuration with p/D = 1.33. The test conditions were: Steam Inlet Pressure, 50 mbar, Inlet velocity 10-30 m s -1 and Steam-to-cooling water temperature difference 5-15 K. This corresponded to a mean bundle Re v,max between 1000 and 7000, suction parameter range 0.3-2.8 and heat flux densities at the tube outside wall up to 79 kW m -2 . In the range 2800 < Re v,max < 6400 increase in condensation rate progressively reduced the Pressure drop coefficient to a minimum of 27-30% of the corresponding dry flow at Re v,max = 2840 and 5320 as predicted by ESDU 74040. The results were compared with previous investigations and condensing Pressure drops found comparable with Nicol et al. [Proc. 7th Int. Heat Transfer Conf. 5 (1982) 133-138] but the Fujii et al. [Int. J. Heat Mass Transfer 15 (1972) 247-260] Pressure drops were always found to be lower by up to 52% than the present data. The flow patterns associated with the effect of condensation on Pressure drop are discussed. The results reported here suggest that considerable errors in Pressure drop, with consequent errors in heat transfer distribution, can result from ignoring the effect of suction as is currently done in condenser design and prediction.

David Archibald Mcneil - One of the best experts on this subject based on the ideXlab platform.

  • Pressure drop measurements in a low Pressure Steam condenser with a horizontal bundle of staggered tubes
    Applied Thermal Engineering, 2004
    Co-Authors: Bodius Salam, David Archibald Mcneil, B M Burnside
    Abstract:

    Abstract Pressure drop measurements were carried out in a test condenser of staggered configuration with p/D=1.33. The test conditions were: Steam Inlet Pressure, 50 mbar, Inlet velocity 10–30 m s−1 and Steam-to-cooling water temperature difference 5–15 K. This corresponded to a mean bundle Rev,max between 1000 and 7000, suction parameter range 0.3–2.8 and heat flux densities at the tube outside wall up to 79 kW m−2. In the range 2800 The results reported here suggest that considerable errors in Pressure drop, with consequent errors in heat transfer distribution, can result from ignoring the effect of suction as is currently done in condenser design and prediction.

  • Pressure drop measurements in a low Pressure Steam condenser with a horizontal bundle of staggered tubes
    Applied Thermal Engineering, 2004
    Co-Authors: Bodius Salam, David Archibald Mcneil, B M Burnside
    Abstract:

    Pressure drop measurements were carried out in a test condenser of staggered configuration with p/D = 1.33. The test conditions were: Steam Inlet Pressure, 50 mbar, Inlet velocity 10-30 m s -1 and Steam-to-cooling water temperature difference 5-15 K. This corresponded to a mean bundle Re v,max between 1000 and 7000, suction parameter range 0.3-2.8 and heat flux densities at the tube outside wall up to 79 kW m -2 . In the range 2800 < Re v,max < 6400 increase in condensation rate progressively reduced the Pressure drop coefficient to a minimum of 27-30% of the corresponding dry flow at Re v,max = 2840 and 5320 as predicted by ESDU 74040. The results were compared with previous investigations and condensing Pressure drops found comparable with Nicol et al. [Proc. 7th Int. Heat Transfer Conf. 5 (1982) 133-138] but the Fujii et al. [Int. J. Heat Mass Transfer 15 (1972) 247-260] Pressure drops were always found to be lower by up to 52% than the present data. The flow patterns associated with the effect of condensation on Pressure drop are discussed. The results reported here suggest that considerable errors in Pressure drop, with consequent errors in heat transfer distribution, can result from ignoring the effect of suction as is currently done in condenser design and prediction.

Hikmet S Aybar - One of the best experts on this subject based on the ideXlab platform.

  • a mathematical model for Steam driven jet pump
    International Journal of Multiphase Flow, 2000
    Co-Authors: N Beithou, Hikmet S Aybar
    Abstract:

    There are several proposed advanced reactor systems that utilize Steam-driven jet pump (SDJP) as an emergency core cooling system. The SDJP is a device without moving parts, in which Steam is used as an energy source to pump cold water from a Pressure much lower than the Steam Pressure to a Pressure higher than the Steam Pressure. In this study, the mathematical modeling of the SDJP has been done under some assumptions for simplicity. An experimental analysis of the high Pressure SDJP has been reported previously. The Pressure profile of SDJP has been compared with Cattadori's experimental Pressure profile. The discharge Pressure in the experiment for the 8.7 MPa Steam Inlet Pressure is given as 9.25 MPa which is 6.3% higher than the Steam Pressure. In the simulation, the discharge Pressure is 9.58 MPa which is 10.1% higher than the Steam Inlet Pressure. The comparisons show that the experimental and calculated Pressure distributions are in good agreement in the mixing nozzle and diffuser, however, there are some difference in Steam nozzle due to the assumptions made for Steam nozzle.

B Mecheri - One of the best experts on this subject based on the ideXlab platform.

  • unsteady Steam condensation flow patterns inside a miniature tube
    Applied Thermal Engineering, 2007
    Co-Authors: Hasna Louahliagualous, B Mecheri
    Abstract:

    Unsteady Steam condensation inside a single miniature tube has been studied. The visualization of different instantaneous and periodically two-phase flow is conducted for different experimental conditions. The two-phase flow characterization is obtained using the image processing. Annular, slug bubbly, spherical bubbly, and wavy flows are observed by varying the Steam Inlet Pressure and cooling heat transfer. The cycle of the periodically flows are compared. It is shown that increasing the cooling heat flow rate reduces the number of the instabilities and the injected bubbles. The axial vapor velocity decreases during the waves growth. The local distribution of the condensate film thickness is analyzed. It is shown that the liquid film becomes thinner near the meniscus-like interface because of the surface tension effect. The reverse annular flow is observed at the end of each periodic flow when the bubbles leave the channel. It can be concluded from experimental results that the stratification effect is not significant during the condensation inside the miniature tube. The capillary Pressure evolution is measured. The maximum values are obtained in the waves locations and near the meniscus of the annular flow.