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Search Results (17)
  • Open Access


    Hydrodynamic Pattern Investigation of Ethanol Droplet Train Impingement on Heated Aluminum Surface

    Baris Burak Kanbur, Sheng Quan Heng, Fei Duan*

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.5, pp. 1331-1338, 2022, DOI:10.32604/fdmp.2022.021793

    Abstract Steady-state hydrodynamic patterns of ethanol droplet train impingement on the heated aluminum surface is investigated in the surface temperature range of 80°C–260°C using two different Weber numbers (We) of 618 and 792. Instead of a vertical train impingement, the droplet train is sent to the aluminum surface with an incline of 63 degrees. Changes in the spreading length are observed at different surface temperatures for two different We values, which are obtained by using two different pinholes with 100 and 150 μm diameters. The greatest spreading length is seen at the lowest surface temperature (80°C) and it continuously decreases until… More >

  • Open Access


    Assessment of the Application of Subcooled Fluid Boiling to Diesel Engines for Heat Transfer Enhancement

    Xiaoyu Hu, Yi Wang, Siyuan Li, Qiang Sun, Shuzhan Bai, Guoxiang Li*, Ke Sun*

    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.6, pp. 1049-1066, 2021, DOI:10.32604/fdmp.2021.016763

    Abstract The increasing demand of cooling in internal combustion engines (ICE) due to engine downsizing may require a shift in the heat removal method from the traditional single phase liquid convection to the application of new technologies based on subcooled fluid boiling. Accordingly, in the present study, experiments based on subcooled flow boiling of 50/50 by volume mixture of ethylene glycol and water coolant (EG/W) in a rectangular channel heated by a cast iron block are presented. Different degrees of subcooling, velocity and pressure conditions are examined. Comparison of three empirical reference models shows that noticeable deviations occur especially when low… More >

  • Open Access


    Application of Superhydrophobic Surface on Boiling Heat Transfer Characteristics of Nanofluids

    Cong Qi*, Yuxing Wang, Zi Ding, Jianglin Tu, Mengxin Zhu

    Energy Engineering, Vol.118, No.4, pp. 825-852, 2021, DOI:10.32604/EE.2021.014806

    Abstract Boiling heat transfer is a mode using the phase change of working medium to strengthen the heat exchange due to its good heat exchange capability, and it is widely used in heat exchange engineering. Nanofluids have been used in the direction of enhanced heat transfer for their superior thermophysical property. The wetting, spreading and ripple phenomena of superhydrophobic surfaces widely exist in nature and daily life. It has great application value for engineering technology. In this article, the boiling heat exchange characteristics of nanofluids on superhydrophobic surface are numerically studied. It was found that with the increase of superheating degree,… More >

  • Open Access


    Analysis of Bubble Behavior in a Horizontal Rectangular Channel under Subcooled Flow Boiling Conditions

    Ke Sun, Xiaoyu Hu, Da Li, Guodong Zhang, Kui Zhao, Haiyang Zhao, Shuzhan Bai*

    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.1, pp. 81-95, 2021, DOI:10.32604/fdmp.2021.013895

    Abstract Experiments on subcooled flow boiling have been conducted using water in a rectangular flow channel. Similar to the coolant channel in internal combustion engines (IC engines), the flow channel in this experiment was asymmetrically heated. Bubble images were captured using a high speed camera from the side view of the channel. The experimental conditions in terms of bulk temperature, bulk velocity, pressure and heat flux ranged from 65°C–75°C, 0.25 m/s–0.75 m/s, 1–1.7 bar and 490 kW/m2–700 kW/m2, respectively. On the basis of these tests, a statistical analysis of the bubble size has been conducted considering a population of 1400 samples.… More >

  • Open Access


    Preliminary Results for Flow Boiling Heat Transfer of R1233zd in Microchannels

    Xinyu You1, Jionghui Liu1, Nan Hua1,3, Ji Wang5, Rongji Xu1,4, Guangxu Yu2, Huasheng Wang1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.3, pp. 143-143, 2019, DOI:10.32604/icces.2019.04732

    Abstract The paper reports preliminary measurement results for flow boiling heat transfer of refrigerant R1233zd in parallel horizontal microchannels. The aluminum test section consists of two blocks and has 10 parallel channels with 1.0 mm in width, 1.5 mm in height and 440 mm in length. Five small thermocouple holes with diameter 0.6 mm and depth 20 mm were drilled at 10 locations along the channel on the two aluminum blocks, respectively. Local heat flux and channel surface temperature along the channel were obtained using the inverse heat conduction method [1] based on temperatures accurately measured by 100 thermocouples. Local saturation… More >

  • Open Access


    Adaptive Modelling for Multiphase Flow Through Debris Bed With Boiling

    Liang Yang1,*, Andrew Buchan2, Alan Jones1, Paul Smith1, Mikio Sakai3, Christopher Pain1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 95-95, 2019, DOI:10.32604/icces.2019.05077

    Abstract In the event of a severe accident, a large part of the core may collapse and form a debris bed. Debris bed coolability is important to avoid releasing the radioactive materials to the environment. If it is not rapidly cooled, the debris bed will begin to melt and become harder to cool. To stop or slow down the accident evolution, the main approach is to inject water into the reactor core. However, the success of the cooling is not guaranteed depending on the debris bed and the operating condition. This procedure is challenging to understand and model, as it involves… More >

  • Open Access


    Convective Boiling in Metallic Foam: Experimental Analysis of the Pressure Loss

    B. Madani1, F. Topin2, L. Tadrist2

    FDMP-Fluid Dynamics & Materials Processing, Vol.6, No.4, pp. 351-368, 2010, DOI:10.3970/fdmp.2010.006.351

    Abstract The present work deals with the hydraulic characterization of two-phase flow with phase change in a channel filled with metallic foam. We provide a general presentation of metallic foams including morphological characteristics, fabrication processes and industrial applications. The experimental facility, which consists of a hydrodynamic loop, the test section, measurement devices, and the data acquisition system, is presented. The Metallic foam sample tested in the present work is manufactured by SCPS (French manufacturer). N-pentane is used as a coolant fluid. The mass velocity values lie between 4 and 49 kg/ m2s, while the heating power in the test section ranges… More >

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