广东化工
廣東化工
엄동화공
GUANGDONG CHEMICAL INDUSTRY
2012年
8期
13-14,4
,共3页
螺旋折流板%壳程压力降%传热系数%数值模拟
螺鏇摺流闆%殼程壓力降%傳熱繫數%數值模擬
라선절류판%각정압력강%전열계수%수치모의
helical baffle%shell side pressure drop%heat transfer coefficient%numerical simulation
建立了连续螺旋折流板换热器三维模型并划分网格,采用分离式求解器、SIMPLE压力速度耦合方式与Realizable k-ε湍流模型,利用FLUENT软件对连续螺旋折流板换热器壳程流体流动与传热进行了模拟计算,得到壳程流体速度、压力与温度分布图,并与传统弓形折流板换热器作比较。螺旋折流板节距与弓形折流板间距相等时,螺旋折流板换热器壳程传热系数增加了25%左右,而压力降减小了18%左右。通过对不同螺旋角度的螺旋折流板换热器进行模拟分析,发现随螺旋角增大壳程传热系数和压力降都呈减小趋势,且壳程流体进口平均速度越大,作用越明显,故在实际工程中,盲目追求高的传热系数或低的压降都是不可取的。本数值模拟可为螺旋折流板换热器进一步的工程研究提供可靠的理论参考依据。
建立瞭連續螺鏇摺流闆換熱器三維模型併劃分網格,採用分離式求解器、SIMPLE壓力速度耦閤方式與Realizable k-ε湍流模型,利用FLUENT軟件對連續螺鏇摺流闆換熱器殼程流體流動與傳熱進行瞭模擬計算,得到殼程流體速度、壓力與溫度分佈圖,併與傳統弓形摺流闆換熱器作比較。螺鏇摺流闆節距與弓形摺流闆間距相等時,螺鏇摺流闆換熱器殼程傳熱繫數增加瞭25%左右,而壓力降減小瞭18%左右。通過對不同螺鏇角度的螺鏇摺流闆換熱器進行模擬分析,髮現隨螺鏇角增大殼程傳熱繫數和壓力降都呈減小趨勢,且殼程流體進口平均速度越大,作用越明顯,故在實際工程中,盲目追求高的傳熱繫數或低的壓降都是不可取的。本數值模擬可為螺鏇摺流闆換熱器進一步的工程研究提供可靠的理論參攷依據。
건립료련속라선절류판환열기삼유모형병화분망격,채용분리식구해기、SIMPLE압력속도우합방식여Realizable k-ε단류모형,이용FLUENT연건대련속라선절류판환열기각정류체류동여전열진행료모의계산,득도각정류체속도、압력여온도분포도,병여전통궁형절류판환열기작비교。라선절류판절거여궁형절류판간거상등시,라선절류판환열기각정전열계수증가료25%좌우,이압력강감소료18%좌우。통과대불동라선각도적라선절류판환열기진행모의분석,발현수라선각증대각정전열계수화압력강도정감소추세,차각정류체진구평균속도월대,작용월명현,고재실제공정중,맹목추구고적전열계수혹저적압강도시불가취적。본수치모의가위라선절류판환열기진일보적공정연구제공가고적이론삼고의거。
The three-dimensional model of spiral baffled heat interchanger was built and meshed.The fluid flow dynamics and heat transfer of shell side in the helical baffled heat exchanger was simulated and calculated,using CFD software FLUENT with segregated solver,SIMPLE pressure-velocity coupling and realizable k-ε viscous model.The velocity,pressure and temperature distributions achieved were compared with conventional segmental baffled heat exchanger.With the same baffle distance,the shell side heat transfer coefficient of helical baffled exchanger was about 25 % higher,while the pressure drop was 18 % lower,than those of segmental baffled heat exchanger.With the analyzing of the flow and heat transfer in heat exchanger with different helical angle baffles,it can be found that both shell side heat transfer coefficient and pressure drop will decrease while the helical angle increases.Numerical simulation provided reliable theoretical reference for further engineering research of heat exchanger with helical baffles.
