化工进展
化工進展
화공진전
Chemical Industry and Engineering Progress
2015年
12期
4203-4208,4219
,共7页
李保有%郭英锋%张磊%刘海军
李保有%郭英鋒%張磊%劉海軍
리보유%곽영봉%장뢰%류해군
数值模拟%计算流体力学%强化传热管%管式裂解炉
數值模擬%計算流體力學%彊化傳熱管%管式裂解爐
수치모의%계산류체역학%강화전열관%관식렬해로
numerical simulation%computational fluid dynamics%intensified heat transfer radiant tube%cracking furnace
利用计算流体动力学(computational fluid dynamic,CFD)方法对含新型内插件强化传热辐射炉管(fortified induced turbulence,FIT)进行了流体流动与传热特性的研究,采用RNG双方程模型求解了动量方程和能量方程,给出了 FIT 炉管内的流体流动和传热特性,包括速度场、湍动强度和温度场的分布;计算了 FIT 炉管的强化传热因子和压降.研究结果表明,F I T炉管内插件迫使流体流动由活塞流转变为旋转流,增强了流动湍流程度,符合流动-能量场协同理论,同时流体边界层由于 FIT 炉管的特殊结构而减薄.FIT 炉管具有增强辐射传热、减薄边界层、增加比表面积和旋流增强等强化传热特性.相比于普通当量圆炉管,FIT强化传热炉管的整体传热能力提高了20%左右,证明该新型炉管强化传热效果显著,可以在工程实际中应用.
利用計算流體動力學(computational fluid dynamic,CFD)方法對含新型內插件彊化傳熱輻射爐管(fortified induced turbulence,FIT)進行瞭流體流動與傳熱特性的研究,採用RNG雙方程模型求解瞭動量方程和能量方程,給齣瞭 FIT 爐管內的流體流動和傳熱特性,包括速度場、湍動彊度和溫度場的分佈;計算瞭 FIT 爐管的彊化傳熱因子和壓降.研究結果錶明,F I T爐管內插件迫使流體流動由活塞流轉變為鏇轉流,增彊瞭流動湍流程度,符閤流動-能量場協同理論,同時流體邊界層由于 FIT 爐管的特殊結構而減薄.FIT 爐管具有增彊輻射傳熱、減薄邊界層、增加比錶麵積和鏇流增彊等彊化傳熱特性.相比于普通噹量圓爐管,FIT彊化傳熱爐管的整體傳熱能力提高瞭20%左右,證明該新型爐管彊化傳熱效果顯著,可以在工程實際中應用.
이용계산류체동역학(computational fluid dynamic,CFD)방법대함신형내삽건강화전열복사로관(fortified induced turbulence,FIT)진행료류체류동여전열특성적연구,채용RNG쌍방정모형구해료동량방정화능량방정,급출료 FIT 로관내적류체류동화전열특성,포괄속도장、단동강도화온도장적분포;계산료 FIT 로관적강화전열인자화압강.연구결과표명,F I T로관내삽건박사류체류동유활새류전변위선전류,증강료류동단류정도,부합류동-능량장협동이론,동시류체변계층유우 FIT 로관적특수결구이감박.FIT 로관구유증강복사전열、감박변계층、증가비표면적화선류증강등강화전열특성.상비우보통당량원로관,FIT강화전열로관적정체전열능력제고료20%좌우,증명해신형로관강화전열효과현저,가이재공정실제중응용.
The flow and heat transfer characteristics of fortified induced turbulence (FIT) tube with inserts were studied with computational fluid dynamics (CFD). The momentum and energy equations were solved by using RNG turbulent flow model. The flow and heat transfer characteristics of FIT tube,namely velocity field,turbulent flow field,temperature field were presented and pressure drop, intensified heat transfer factors were calculated. The heat transfer of FIT tube was intensified because swirling flow instead of piston flow by using special tape placed inside the FIT tube caused more turbulence and hydrodynamic boundary layer was cut thinner. Multiple mechanism elements (radiation factor,surface factor,twist factor and boundary layer cutting factor) to intensify the heat transfer of furnace radiant tube were established in the analysis. Compared with plain tube,FIT tube showed a significant increase of heat transfer by about 20%,and could be used as a good heat transfer radiation tube.