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Zhang G.-M.,Shandong University | Li G.-Q.,Zhejiang University | Li W.,Zhejiang University | Huang T.,Shanxi FTEC Engineering Co. | Ren Y.-C.,Shanxi FTEC Engineering Co.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2013

Plate heat exchangers have been widely used in the practical industrial applications for perfect performance including high efficiency, power saving and compact size. Particulate fouling has been concerned as one of the common component in actual cooling water. Four commercial plate heat exchangers have been tested. After the heat and flow performance of the four PHEs was obtained, three particulate fouling tests have been finished concerning geometry designs, flow parameters and particle concentration. Particulate fouling model, which are based on Von-Karman analogy, has been established combining with test results. The correlations of particle fouling show the best predictions, which are all less than ±6% comparing with the experiment results. Source

Luo L.,Shandong University | Pan J.,Shandong University | Tian M.,Shandong University | Huang T.,Shanxi FTEC Engineering Co. | Ren Y.,Shanxi FTEC Engineering Co.
Huagong Xuebao/CIESC Journal | Year: 2013

The flow and heat transfer characteristics of falling water film outside horizontal tubes in falling film evaporators in seawater desalination were investigated with two-dimensional numerical simulation. Two types of tubes, including a smooth circular tube and six oval-shaped tubes were employed in the simulation. The physical model and mathematical equations for the circular tube and oval-shaped tubes are represented separately. Volume of fluid method is employed to investigate the influence of sectional shape of tube on distribution of film thickness and heat transfer performance. The numerical results indicate that the flow velocity of falling film on the oval-shaped tubes is larger and the film around the oval-shaped tube is more uniform and thinner than that around the circular tube. The film thickness grows with increasing semi-axis ratio, ε, and decreases gradually at first and then increases rapidly along the circumference. The minimum value of the film thickness appears approximately at the circumferential dimensionless position of 0.69 and 0.70-0.84 for the smooth circular tube and oval-shaped tubes, respectively. Compared with the circular tube, the oval-shaped tubes have lower dimensionless temperature and thinner thermal boundary layer, so that heat transfer performance is better. The oval-shaped tube with ε of 2.4 presents the best heat transfer performance with Nu of 0.32, which is 12.68% higher than that of the circular tube. The numerical results correlate well with the experimental and predicted data in literature. © All Rights Reserved. Source

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