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  • 1
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    Experimental investigation of shell-side steam pressure drop in crossflow in a horizontal falling-film tube bundle (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-09-24
    Description: An experimental investigation of the steam flowing across a horizontal tube bundle with liquid falling film was conducted to simulate flow characteristics in a large desalination plant. Experiments were conducted at pressure ranging from 12 kPa to 31 kPa with the corresponding saturated steam temperature of 50 °C to 70 °C and the falling film spray density of 0.02 kg·m -1 ·s -1 to 0.08 kg·m -1 ·s -1 . The influence of the spray density, saturated temperature and tube bundle geometry structure on steam pressure drop was illustrated. The results indicate that the pressure drop increased with increasing spray density, but decreased with increasing saturated temperature. The pressure drop at the maximum spray density of 0.08 kg·m -1 ·s -1 can be three times that in spray density of 0.02 kg·m -1 ·s -1 and the pressure drop at 50 °C is almost twice that at 70 °C. Under the same condition, the pressure drop throu...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    A cryogenic heat exchanger with bypass and throttling and its thermodynamic analysis (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-12-19
    Description: A precooled Joule-Thomson (J-T) cooler refrigerates at liquid helium temperature. Its third stage heat exchanger works below 20 K. Hot fluid cannot be sufficiently cooled due to nonidealism of the heat exchanger and helium-4 properties. In a J-T cycle of low pressure ratio, the heat exchanger with bypass and throttling improves the refrigeration capacity. Bypass and throttling reduces the temperature difference and entropy generation within the heat exchanger.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 3
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    Using the DEM-based Xin'anjiang hydrologic model to simulate hydrologic characteristics in SiheRiver Basin (2016)
    Institute of Physics (IOP)
    Details
    Publication Date: 2016-09-03
    Description: In order to consider the spatial distribution of precipitation, the basin is generally divided by the Thiessen polygon method with the same concentration parameters in all divided units in Xin'anjiang hydrologic model, without considering the impact of terrain. The runoff concentration characteristics depend on the terrain condition to a great extent.Therefore, it is necessary to consider the impact of terrain condition in the model. The purpose of this article is to consider the impact of terrain condition to improve the Xin'anjiang hydrologic model. The basin is divided, and then the slopes of the divided sub-basins and the distances to the basin outlet are extracted based on the DEM. Twofunction relations between the terrain slope and the runoff concentration are established, and the application results of Sihe river basin show that the Xin'anjiang hydrologic model simulation precision is improved greatly based on the DEM,and it is more reasonable that the recession coefficie...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 4
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    The Measurement and Uncertainty Analysis of Thermal Resistance in Cryogenic Temperature Sensor Installation (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-03-01
    Description: The choice of the appropriate installation method plays an important role for accurate temperature measurement. In the cryogenic and high vacuum environment, due to poor contact between the cryogenic temperature sensor and the surroundings that the sensor is installed and intended to measure, the self-heating from sensor measuring current brings about temperature difference and creates a potential temperature measurement error. The self-heating temperature difference is directly proportional to the thermal resistance for a mounted sensor, which means that lower installation thermal resistance of sensors is advantageous to obtain better measurement results. In this paper, a measurement model for the installation thermal resistance of sensor is built in terms of two currents method which is always used to measure self-heating effect. A cryostat that can provide variable temperature in the accurate temperature measurement and control experiments is designed and manufactured. This c...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
    Location Call Number Expected Availability
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