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首页> 外文期刊>International Journal of Heat and Mass Transfer >3D numerical simulation on shell-and-tube heat exchangers with middle-overlapped helical baffles and continuous baffles - Part I: Numerical model and results of whole heat exchanger with middle-overlapped helical baffles
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3D numerical simulation on shell-and-tube heat exchangers with middle-overlapped helical baffles and continuous baffles - Part I: Numerical model and results of whole heat exchanger with middle-overlapped helical baffles

机译：带有中间重叠螺旋形挡板和连续挡板的管壳式换热器的3D数值模拟-第一部分：带有中间重叠螺旋形挡板的整个热交换器的数值模型和结果

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摘要

In the present study, a 3D numerical simulation of a whole heat exchanger with middle-overlapped helical baffles is carried out by using commercial codes of GAMBIT 2.3 and FLEUNT 6.3. At first, the computational model and numerical method of the whole heat exchanger with middle-overlapped helical baffles is presented in detail, and parallel computation mode is adopted for the simulation of a whole heat exchanger with six cycles of the middle-overlapped helical baffles of 40° helical angle on a grid system of 13.5-million cells; second, the validation of the computational model is performed by comparing the total pressure drop and average Nusselt number of the whole heat exchanger with experimental data. Reasonably good agreement is obtained, and the reasons causing to the discrepancy are analyzed. The shell-side fluid pressure and temperature fields of the whole area are then presented. Finally the cycle average Nusselt number of different cycle in the heat exchanger are compared and it is found that within the accuracy allowed in engineering computation, periodic model for one cycle can be used to investigate the heat transfer and pressure drop characteristics for different heat exchanger to save computational source. The companion paper will provide details of simulation results using the periodic model for different helical angles and different structures of helical baffles.
机译：在本研究中，通过使用GAMBIT 2.3和FLEUNT 6.3的商业代码，对带有中间重叠螺旋形挡板的整个热交换器进行了3D数值模拟。首先详细介绍了整个中螺旋折流板换热器的计算模型和数值方法，并采用并行计算模式模拟了六个循环中螺旋折流板的整个换热器。 1350万个单元的网格系统上的40°螺旋角；其次，通过将整个换热器的总压降和平均努塞尔数与实验数据进行比较来进行计算模型的验证。获得了合理的良好一致性，并分析了导致差异的原因。然后给出了整个区域的壳侧流体压力和温度场。最后比较了换热器内不同循环的平均努塞尔数，发现在工程计算允许的精度范围内，一个循环的周期模型可用于研究不同换热器的传热和压降特性。保存计算源。随附的论文将提供使用周期性模型针对不同螺旋角和不同螺旋挡板结构的仿真结果的详细信息。

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