Yixing Li

Shanghai Jiao Tong University, Shanghai, Shanghai Shi, China

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Publications (6)0 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: An experimental investigation of the thermodynamic performance of a counter-flow spray humidifier was conducted on the basis An experimental investigation of the thermodynamic performance of a counter-flow spray humidifier was conducted on the basis of theoretical analysis of the heat and mass transfer mechanism inside the humidifier. Critical parameters such as the temperature of theoretical analysis of the heat and mass transfer mechanism inside the humidifier. Critical parameters such as the temperature and relative humidity of air and the temperature of water at the inlet and outlet were measured. The influence of every measured and relative humidity of air and the temperature of water at the inlet and outlet were measured. The influence of every measured parameter on the thermal performance of the humidifier was obtained under different experimental conditions. The cooling number, parameter on the thermal performance of the humidifier was obtained under different experimental conditions. The cooling number, whose variation was also obtained, was calculated according to the measured data. The experimental results show that both whose variation was also obtained, was calculated according to the measured data. The experimental results show that both the temperature and the temperature increment of outlet humid air and the temperature of outlet water increase with an increase the temperature and the temperature increment of outlet humid air and the temperature of outlet water increase with an increase of the water-gas ratio, whereas the cooling number decreases. Under all experimental conditions, the outlet humid air reaches of the water-gas ratio, whereas the cooling number decreases. Under all experimental conditions, the outlet humid air reaches or is close to the saturation level. The lower cooling number is favorable for the system, but it has an optimal value for or is close to the saturation level. The lower cooling number is favorable for the system, but it has an optimal value for a certain humidifier. a certain humidifier.
    Frontiers of Energy and Power Engineering in China 02/2008; 2(1):43-47.
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    ABSTRACT: The numerical simulations of simultaneous heat and mass transfer process in the counter-flow spray saturator and humid air turbine cycle are carried out in this work, according to the experimental conditions and actual size of a prototype saturator. This humidifying process involves two-phase flow of air and water droplets, also including interaction, breakup and collision of water droplets. Eulerian approach is used for gas phase flow, Lagrangian approach is used for liquid phase flow, and the two-way coupling is used between two phases. The simulations agree well with the experimental measurements. The simulations show the flow is with high turbulence intensity, the relative humidity and temperature of humid air increase along with the height of saturator, some water droplets carried by air escape from the saturator, and the humid air is mainly humidified at the lower part of saturator and is simultaneously humidified and heated at the upper part.
    Energy. 01/2007;
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    ABSTRACT: Based on previous work, a new temperature measuring system for gas–liquid flow, composed of shielded and unshielded thermocouples, on-line laser detection device for liquid droplets, vacuum pump and wavelet analysis data processor, is developed in this work. The necessity of vacuum pump and the criterion of mesh size selection are also described. Through an application of measuring temperature in saturator, it shows that the system can evaluate the separation of gas–liquid two-phase flow and measure the liquid droplet temperature and the gas temperature effectively in counter-current spraying field.
    Experimental Thermal and Fluid Science. 01/2007;
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    ABSTRACT: A number of experiments of the humidifying performance of a counter flow spray saturator (CFSS) for a humid air turbine (HAT) cycle are conducted in this work. The critical parameters, such as the temperature and relative humidity of the humid air and the temperature of the water droplets in the saturator as well as its inlet and outlet, are measured. The absolute humidity of the humid air at every measuring location and the evaporative capacity between two measuring locations along with the height of the saturator are obtained according to these measured data. The temperature of the outlet humid air increases with increasing water-gas ratio, and the outlet humid air reaches or is close to the saturation level. On the whole, the temperature and relative humidity of the humid air in the saturator is enhanced along with the height of the saturator. The water droplets entrainment is mainly decided by the diameter of the water droplets and the velocity of the humid air. There is a small temperature difference between the humid air and the water droplets in most areas of the saturator. The experiments show the humid air is mainly humidified at the lower part of the saturator and is simultaneously humidified and heated at the upper part.
    Energy Conversion and Management - ENERG CONV MANAGE. 01/2007; 48(3):756-763.
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    ABSTRACT: This paper presents the application of artificial neural network (ANN) in saturator. Phase Doppler Anemometry (PDA) is utilized to investigate the distribution of water droplets diameter and velocity in the saturator. The data obtained from experiment is used as input-output of ANN. Before using ANN method, some prerequisites have to be processed, including the selection of the number of input and output variables, hidden layer neurons, the network architecture and the normalization of data etc. The results indicate that the trained ANN can provide accurate prediction values which agree with real experimental data closely.
    Advances in Neural Networks - ISNN 2006, Third International Symposium on Neural Networks, Chengdu, China, May 28 - June 1, 2006, Proceedings, Part III; 01/2006
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    ABSTRACT: An experiment investigation of inner two-phase flow in the counter-flow spray saturator (CFSS) for humid air turbine (HAT) cycle and the simulation of the moving distance of water droplets in counter-flow air are presented here aimed at the understand of two-phase flow in the CFSS in detailed. Dual phase Doppler anemometry (DualPDA) system is applied to obtain the spatial change of the droplet size spectrum in the flow-field to correlate droplet size–velocity correlation. The local measurement profiles of 3D mean velocities and diameters of water droplets are obtained by averaging droplet size classes. Moreover, DualPDA signal processing allows for accurate determination of the volume flux of spherical water droplets. The transient velocity fields are measured by a laser-based particle image velocimetry (PIV) system. The commercial CFD software, FLUENT, is used to simulate the maximum moving distance of water droplets with different diameters and inlet velocities in the counter-flow air with different inlet velocities, then the quantity of water droplet entrainment in the saturator can be estimated.
    Applied Thermal Engineering - APPL THERM ENG. 01/2006; 26(17):2417-2424.

Publication Stats

13 Citations

Institutions

  • 2007–2008
    • Shanghai Jiao Tong University
      • School of Mechanical Engineering
      Shanghai, Shanghai Shi, China