Wang Q.,Lanzhou LS Heat Exchange Equipment Co. |
Zhou R.,Shanghai Heat Transfer Equipment Co.
Petrochemical Equipment | Year: 2014
Numerical simulation is conducted on chevron-type plate channel. The heat transfer factor j and friction factor / were calculated under different structural parameters. The transforming laws of heat transfer and resistance characters with the corrugation inclination, the corrugation height and the corrugation pinch are obtained and the overall performance of these channels is evaluated. Finally, the mechanism of the heat transfer enhancement is analyzed according field synergy principle.
Li Y.-H.,Lanzhou LS Heat Exchange Equipment Co. |
Yvang X.-C.,Lanzhou LS Heat Exchange Equipment Co. |
Li Z.-Y.,Lanzhou LS Energy Equipment Engineering Research Institute Co.
Petrochemical Equipment | Year: 2016
A thermal performance test is conducted on a prototype of half storage type heat exchangers which use stainless steel bellows as heat transfer element, and compared the tested results with the calculated results by HTRI software, then discussed the heat transfer calculation method of this kind of equipment. Under the operating condition of large flow, the overlapped tube bundles for half storage type heat exchanger are designed, which can reduce the heat exchange area and optimize the heat exchange performance of the equipment. And the final operating effect shows that, with this design, the heat transfer coefficient can reach to 1 600 W/(m2 • K).
Chen H.,Jiangsu University |
Zhao Y.,Lanzhou LS Heat Exchange Equipment Co. |
Lin Q.,Jiangsu University |
Deng Y.,Shanghai Electrical Machinery Co. SEC |
And 2 more authors.
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2012
In order to investigate the mechanism of lime slurry droplet charging and absorbing SO 2, the electrostatic spraying two-phase flow field of lime slurry was numerically simulated. Geometric model, electrostatic model and two-phase flow model were established based on the characteristics of desulphurization tower and charge electron spray desulphurization. The characteristic of ring-like electrostatic field was obtained by extending commercial Fluent 6.3 function to achieve the coupled simulation between electrostatic field and two-phase flow field. The two phase flow characteristics and desulphurization effect under the condition of slurry electric charge were analyzed. The results show that the distribution of electric intensity is basically symmetrical about the desulfurization tower axis. The electric intensity decreases rapidly with the increasing of distance away from electrode. The outboard entrainment zone is increased and the velocity is decreased by electron charge in slurry drop, and the zone near electrode effected by jet flow is shortened to strengthen the two phase contact and SO 2 absorption. The electrostatic charged desulphurization with same flows direction is better than that with opposite flow direction.
Ren L.-B.,Shandong University |
Han J.-T.,Shandong University |
He H.-L.,Lanzhou LS Heat Exchange Equipment Co.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2015
This paper presents parallel simulation techniques for the pseudo three-dimensional CFD-DEM model based on the MPICH2 platform of FLUENT software. This parallel model has good scalability with the increase of CPU numbers, and parallel computing can be speeded up with the increase of compute nodes. The convergence of the governing equations was improved by constructing a void fraction scalar field and reorganizing the gas-phase governing equations, which followed a volume-averaged form of the two-fluid model. The parallel solution of the gas-phase governing equations and the DEM were implemented by a standard module and UDF(User-Defined Function), respectively. In the DEM computing, the particle message passing between neighboring subdomains was completed by message-passing macros. The parallel CFD-DEM model was applied in gas-solid two-phase flow simulation on unstructured meshes and the results are in good agreement with related experiments, which shows that this model can be applied in studying dense particulate flows. ©, 2015, Zhejiang University. All right reserved.