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登錄heat transfer的案例
麻省理工傳熱學(xué)教材:A Heat Transfer.pdf
麻省理工傳熱學(xué)教材:A Heat Transfer.part1.rar
麻省理工傳熱學(xué)教材:A Heat Transfer.part2.rar
麻省理工傳熱學(xué)教材:A Heat Transfer.part3.rar
麻省理工傳熱學(xué)教材:A Heat Transfer.part4.rar
滲流應(yīng)力耦合分析(幫助文檔節(jié)選)
Optional modeling of coupled heat transfer
When coupled temperature–pore pressure elements are used, heat transfer is modeled in these elements by default. However, you may optionally choose to switch off heat transfer within these elements during some steps in the analysis. This feature may be helpful in reducing computation time during certain phases in the analysis when heat transfer is not an important part of the overall physics of the problem.
Input File Usage: Use the following option either during a transient or a steady-state procedure to suppress heat transfer modeling:
*SOILS, CONSOLIDATION, HEAT=NO
Abaqus/CAE Usage: Switching off the heat transfer part of the physics is not supported in Abaqus/CAE.
展開 CFdesign在汽車電控模塊熱分析中的應(yīng)用
Introducing an effective heat transfer area has solved the problems and a unique correlation is proposed.Numerical simulations also clarified the effect of thermal conductivity ratio on the non-dimensional effective heat transfer area, and further the heat transfer characteristics when two or more module packages are set in the same duct.
CFdesign在汽車電控模塊熱分析中的應(yīng)用.pdf
展開 LS-DYNA ANALYSIS FOR THERMAL的資料
LS-DYNA ANALYSIS FOR THERMAL的資料
01
LS-DYNA_Heat_Transfer_Manual.part1.rar
LS-DYNA_Heat_Transfer_Manual.part2.rar
LS-DYNA_Heat_Transfer_Manual.part3.rar
LS-DYNA_Heat_Transfer_Manual.part4.rar
LS-DYNA_Heat_Transfer_Manual.part5.rar
展開 
star-ccm+管內(nèi)換熱知識之關(guān)于對流換熱系數(shù)的解釋
對于雙向耦合的流體/體溫度計(jì)算來說,我們的建議方案是:固體模型傳遞給流體模型表面溫度
●流體模型傳遞給固體模型對流換熱系數(shù)和響應(yīng)的參考溫度
STAR CCM Orline
■單熱模型:不包括相變、輻射換熱
◆使用 Specified Y+ Heat transfer Coefficient和 Specified Y+ Heat transfer Reference Temperature
多熱模型:流體流動(dòng)+輻射+相變
◆使用 Local heat transfer coefficient和 Local Heat Transfer Reference Temperature
1)局部換熱系數(shù) Local heat transfer coefficient(LHTC)
不合理的參考溫度將會(huì)造成不合理的數(shù)值對于lowy+網(wǎng)格來說,其結(jié)果與文獻(xiàn)差別較大
2)設(shè)置y+值換熱系數(shù) Specified y+ Heat transfer coefficient(Sy+HTC)
●合理的y+值可以得到與文件一致的數(shù)值不需要選擇參考溫度
3)換熱系數(shù) Heat transfer coefficient(HTC)
危險(xiǎn),如果選擇不合理的參考溫度,可能得到負(fù)值的HTC當(dāng)溫度變化是,比較難以確定參考溫度
4)虛擬局部換熱系數(shù) /irtual local heat transfer coefficient( VLHTC
危險(xiǎn),謹(jǐn)慎使用不與任何參考溫度配對與文獻(xiàn)的數(shù)值差別較大
文章來源:新能源汽車熱管理仿真技術(shù)
展開 AMESim Libraries
Two-Phase Flow
This library based on a lumped transient heat transfer enables you to model complex system networks in which the fluid, at some stage, is submitted to phase changes.
(熱傳導(dǎo)的)對流系數(shù)
自由空氣和壓縮空氣的對流系數(shù)范圍列于下表:
Mode
Btu/sec/in2/F
N/sec/mm/C
Free air convection
1.93x10-6 - 9.645x10-6
5x10-3 - 25x10-3
Forced air convection
3.86x10-6 - 192.9x10-6
10x10-3 - 500x10-3
The equation for convection heat transfer is:
對流熱傳導(dǎo)方程:
qc = ACnvcof(Ts-Etemp)
where
這里
qc heat transfer associated with convection
qc 與對流對應(yīng)的熱傳導(dǎo)量
A convection heat transfer area
A 對流熱傳導(dǎo)面積
Cnvcof convection coefficient
Cnvcof 對流系數(shù)
Ts surface temperature
Ts 表面溫度
Etemp environmental temperature
Etemp 環(huán)境溫度
Applicable simulation types: Heat Transfer
適用的模擬類型:熱傳導(dǎo)
Non-Isothermal Deformation
非等溫變形
RELATED TOPICS
相關(guān)主題
Keywords: ENVTMP
關(guān)鍵字:ENVTMP
展開 國外COSMOS用戶組問題集粹3----evaporation and cosmos fl
If you're looking to
simulate boiling heat transfer that's one thing. Actual mass transfer
is another and a thermodynamic process is another still.
Doing thermal conduction with a phase change isn't too tough because
you can define a discontinuous specific heat to include latent heat of
evaporation. You can estimate boiling heat transfer from one of the
many correlations available and apply it as a film coefficient in heat
transfer problems. That's not too tough. There are analogies between
mass and heat transfer that may allow you to simulate evaporation and
mass transfer in something like a cooling tower, but it'll be a tricky
job. You'll need to know a fair amount about the specific process.
展開 ANSYSY CFX算例精選 室內(nèi)通風(fēng)仿真計(jì)算
【Heat Transfer】>【Option】>【Opening Temperature】>21[C],其余設(shè)置為默認(rèn),點(diǎn)擊【OK】完成設(shè)置。
(5)顯示器邊界設(shè)置
在Outline下的Default Domain行單擊右鍵,選擇【Insert】>【Boundary】選項(xiàng),在Name欄后填入“monitors”,點(diǎn)擊【OK】。
進(jìn)入到Basic Settings設(shè)置欄中,保持【Boundary Type】>【W(wǎng)all】。選擇【Location】>【MONITORS】。
切換至Boundary Details設(shè)置欄中,定義【Heat Transfer】>【Option】>【Temperature】>【Fixed Temperature】>30[C],其余設(shè)置為默認(rèn),點(diǎn)擊【OK】完成設(shè)置。
(6)機(jī)箱邊界設(shè)置
在Outline下的Default Domain行單擊右鍵,選擇【Insert】>【Boundary】選項(xiàng),在Name欄后填入“computerVent”,點(diǎn)擊【OK】。
進(jìn)入到Basic Settings設(shè)置欄中,設(shè)置【Boundary Type】>【Outlet】。選擇【Location>【COMPUTER1VENT,COMPUTER2VENT,COMPUTER3VENT,COMPUTER4VENT】。
切換至Boundary Details設(shè)置欄中,設(shè)置【Mass And Momentum】>【Mass Flow Rate】>0.132[kg s^-1]。定義【Heat Transfer】>【Option】>【Static Temperature】>40[C],其余設(shè)置為默認(rèn),點(diǎn)擊【OK】完成設(shè)置。
展開 復(fù)合固體層中的輻射與傳導(dǎo)
“Two-Flux and Diffusion Methods for Radiative Transfer
in Composite Layers”. Journal of Heat Transfer, Vol 118, pp. 218-222, 1996
四十四、Fluent 收斂標(biāo)準(zhǔn)-質(zhì)量和能量守恒
wx_fmt=png" width="100%"> </p><p><br></p><p>但是有幾點(diǎn)需要注意:</p><p> </p><p><strong>2.1 Options包含三個(gè)選項(xiàng):</strong></p><p><br></p><p>Mass Flow Rate、Total Heat Transfer Rate和Radiation Heat Transfer Rate,其他的以后補(bǔ)充。通過這三個(gè)選項(xiàng)可判斷計(jì)算是否滿足質(zhì)量守恒和能量守恒。</p><p> </p><p><strong>2.2 不涉及源項(xiàng)問題</strong></p><p><br></p><p>mass flow rate:所有進(jìn)出口質(zhì)量流率之和應(yīng)該為0,其中進(jìn)口為正,出口為負(fù)。Net Results表示進(jìn)出口質(zhì)量流率之和。壁面wall顯示為0,計(jì)算域內(nèi)的質(zhì)量流量顯示不為0,但計(jì)算Net Results時(shí),內(nèi)部區(qū)域會(huì)被跳過,只計(jì)算進(jìn)出口區(qū)域。</p><p><br></p><p><span style="color: rgb(255, 129, 36);">Net Results:只計(jì)算模型進(jìn)出口的質(zhì)量流量</span></p><p> <img src="https://mmbiz.qpic.cn/mmbiz_jpg/8tJMdLVYZy9aicLdtZXwZOLDDLnP3ic2M27TiberCOtcIXbGqicbpLcOc0tLH09YZNicBfhD7vrvDChCRmcsGcRic7ibA/640?wx_fmt=jpeg" width="100%"> </p><p><br></p><p>Total Heat Transfer Rate:所有進(jìn)出口及壁面的總傳熱率之和應(yīng)該為0,即Net Results=0。計(jì)算域內(nèi)的總傳熱率顯示為0。
展開 
相變儲(chǔ)熱及卡諾電池研究進(jìn)展
Modeling metal foam enhanced phase change heat transfer in thermal energy storage by using phase field method. International Journal of Heat and Mass Transfer, 2016, 99: 170-181.
[2] Yao Zhao, Changying Zhao, Zhiguo Xu. Numerical study of solid-liquid phase change by phase field method. Computers & Fluids, 2018, 164: 94-101.
[3] 游吟, 趙耀, 趙長穎, 劉紅兵. 相變儲(chǔ)熱單元內(nèi)肋片結(jié)構(gòu)的拓?fù)鋬?yōu)化. 科學(xué)通報(bào), 2019, 64 (11): 1191-9.
[4] Yao Zhao, Yin You, Hongbing Liu, Changying Zhao, Zhiguo Xu. Experimental study on the thermodynamic performance of cascaded latent heat storage in the heat charging process. Energy, 2018, 157: 690-706.
[5] Yao Zhao, Hongbing Liu, Changying Zhao. Experimental study on the cycling stability and corrosive property of Al-Si alloys as phase change materials in high-temperature heat storage.
展開 建立載荷步Step時(shí),需要考慮是瞬態(tài)溫度分析還是穩(wěn)態(tài),建立熱傳遞載荷步注意選擇Heat transfer,如圖3所示,在根據(jù)圖4選擇穩(wěn)態(tài)傳遞還是瞬態(tài)傳遞,以及時(shí)間的設(shè)定。
圖3 載荷步定義1
圖4 載荷步定義2
接著在Interaction模塊下,需要定義接觸面的關(guān)系。通常結(jié)構(gòu)分析時(shí)直接通過Interaction Manager管理器定義接觸,而溫度場傳遞時(shí)這樣處理肯定是不可以的,而是需要建立綁定關(guān)系,也就是定義Tie,綁定兩個(gè)接觸面即可,如圖5。同時(shí),如果模型表面存在熱傳導(dǎo),需要定義對流傳導(dǎo)參數(shù)。
圖5 定義Tie屬性
再接著,在Load模塊,需要通過Predefined Field定義初始溫度場,一般初始溫度全都定義為20度。
圖6 初始溫度場定義
再接著,在Mesh模塊下,劃分網(wǎng)格,接觸面的網(wǎng)格不一定非要全部節(jié)點(diǎn)能夠?qū)?yīng),需要注意的是劃分單元的選擇,如圖7,應(yīng)該選擇Heat Transfer單元,否則不可以計(jì)算。
圖7 Heat Transfer單元
之后進(jìn)入Job模塊,創(chuàng)建Job并求解,求解得到溫度場分布如圖8,圖中很明顯,雙層管的溫度場分布是連續(xù)的,并且接觸面的溫度場基本一致,表示接觸面的溫度場正確傳導(dǎo)。
圖8 溫度場
3 熱結(jié)構(gòu)耦合
計(jì)算出溫度場之后即可在此基礎(chǔ)上進(jìn)行熱結(jié)構(gòu)耦合分析,直接復(fù)制熱分析的Model,在此基礎(chǔ)上作修改。需要修改的地方:
(1)Step模塊
定義兩個(gè)載荷步(根據(jù)需要,第二個(gè)載荷步是耦合),如圖9,Static載荷步,在第二個(gè)耦合載荷步里面屬于穩(wěn)態(tài)求解,定義一個(gè)子步就可以。
圖9 熱結(jié)構(gòu)耦合載荷步定義
(2)Interaction模塊
在此需要將Tie刪除,并且重新建立接觸關(guān)系,即Contact關(guān)系。
展開 abaqus梁單元的熱分析?
各位大佬,請問abaqus里三維梁單元無法進(jìn)行heat transfer分析嗎,在mesh類型里,選擇heat transfer后單元類型的后面沒有增加T,計(jì)算的時(shí)候也會(huì)報(bào)錯(cuò),顯示單元缺少屬性定義。
消失模-參數(shù)設(shè)置
泡沫材料參數(shù):熱導(dǎo)率、密度、比熱、潛熱、液固相線(燃燒范圍)
砂型材料參數(shù):熱導(dǎo)率、密度、比熱、滲透率
邊界條件:壓力,啟用GAS,設(shè)置PREF,PINLET設(shè)為1
在p.dat中添加:
FOAMHTC – heat transfer coefficient between metal and foam across pyrolytic zone (0.002 cal/cm2/C/sec). Automatically varies depending on distance across the zone.
FOAMHTCMAX – heat transfer coefficient when metal contacts the foam (0.1 cal/cm2/C/sec).
BURNZONE – defines pyrolytic zone width in centimeters (3.0 cm)
GASFRAC – fraction of foam volume that converts to gas (0.1)
注意:Burnzone必須大于網(wǎng)格尺寸!
泡沫密度、比熱、潛熱越大,燃燒越緩慢,充型時(shí)間越長。
局限性:目前的求解未考慮泡沫的滲透性——所有的氣體只能從砂箱逸出。
展開