為獲得板翅式換熱器整體結(jié)構(gòu)內(nèi)的流場與流量分配特性,采用聯(lián)合仿真中MATLAB和FLUENT計(jì)算模型的流動(dòng)和傳熱模塊,在壓力場和溫度場相互耦合的情況下,以天然氣為例分析板翅式換熱器內(nèi)部流量分配特性對換熱的影響。研究表明:板翅式換熱器內(nèi)由于流量分配不均而引起的出口溫度分布不均更為嚴(yán)重;天然氣側(cè)在不發(fā)生相變的情況下,因溫度壓力變化會(huì)使密度升高約10％,動(dòng)力黏度降低13％;流量由小到大變化會(huì)使表面?zhèn)鳠嵯禂?shù)增加約1.9倍,計(jì)算微元壓降增加約3.5倍;板翅式換熱器內(nèi)由于流量分配不均而出現(xiàn)的小質(zhì)量流量和大質(zhì)量流量都會(huì)造成換熱效率下降,出現(xiàn)換熱面積不能得到充分利用或天然氣不能冷卻到理想溫度等問題。

　　關(guān)鍵詞: 聯(lián)合仿真 板翅式換熱器 天然氣 換熱 流量分配

　　Study on heat transfer characteristics of plate-fin heat exchanger based on joint simulation

　　In order to obtain the flow field and flow distribution characteristics in the overall structure of plate-fin heat exchanger, the flow and heat transfer modules in the MATLAB and FLUENT computational models in the joint simulation are adopted. Taking the natural gas as an example under the condition that the pressure and temperature fields are coupled, the influence of internal flow distribution characteristics on the heat transfer in the plate-fin heat exchanger is analyzed. The results show that the uneven distribution of outlet temperature in the plate-fin heat exchanger is more serious due to the uneven flow distribution. When the phase change does not occur on the natural gas side, the density would increase by about 10％, the dynamic viscosity would decrease by 13％, the surface heat transfer coefficient would increase by about 1.9 times, and the calculated micro-element pressure drop would increase by about 3.5 times due to the variation of temperature and pressure. Moreover, the small mass flow and large mass flow in the plate-fin heat exchanger due to uneven flow distribution will cause the decrease of the heat transfer efficiency, resulting in the insufficient utilization of heat transfer area or the failure of natural gas to cool to the ideal temperature.

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