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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>山東快速接頭流體工具,流體</p><p><span>***更新：</span>2021-01-14 12:17:41</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="5vtrhlb" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海邁頜信息科技有限公司</a></p><p><span>聯(lián)系人：</span>王欽</p><p><span>郵箱: </span>834334323@qq.com</p><p><span>電話: </span>18917232386</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.maihetech.com</p><p><span>手機(jī): </span>021-62086881</p><p><span>地址: </span>上海市松江區(qū)九亭鎮(zhèn)九亭中心路1158號(hào)21幢708室-2A</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="xvlt7lz" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="5flzp5h" class="box"><p><p style="text-indent:25px">壓差阻力和摩擦阻力：從受力角度分析，物體受到的阻力是流體直接作用在其表面上的。垂直于物體表面的是流體的壓力，其產(chǎn)生的阻力稱(chēng)為壓差阻力；平行于物體表面的是流體的黏性剪切力，其產(chǎn)生的阻力稱(chēng)為摩擦阻力。除了這兩種力之外，再?zèng)]有其它的力了，山東快速接頭流體工具。所以物體的總阻力就是壓差阻力和摩擦阻力的合力，壓差阻力與物體的形狀密切相關(guān)，摩擦阻力則主要與物體的表面積相關(guān)。有些地方說(shuō)除了壓差阻力和摩擦阻力之外還存在誘導(dǎo)阻力，以及激波阻力等，山東快速接頭流體工具，山東快速接頭流體工具，是屬于一種誤解。實(shí)際上誘導(dǎo)阻力和激波阻力都可以歸結(jié)為壓差阻力和摩擦阻力（主要是壓差阻力）。液體和氣體的交界面稱(chēng)為自由液面。山東快速接頭流體工具</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山東快速接頭流體工具,流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847473994141/8668307.png"></div><p style="text-indent:25px">流體性質(zhì)：質(zhì)量和密度流體和其他物質(zhì)一樣，具有質(zhì)量和重量。單位體積的流體所具有的質(zhì)量稱(chēng)為流體的密度，用ρ來(lái)表示。在流體中任意點(diǎn)處的密度均相同，則該流體為均勻流體，均勻流體的密度表示為，ρ=m/v 。對(duì)于非均勻流體，因?yàn)楦鼽c(diǎn)處的密度不同，所以按下式計(jì)算的只是流體的平某一點(diǎn)處的密度應(yīng)為：dm——所取某微元件的的質(zhì)量（kg） dV——質(zhì)量為dm的微元件的體積（m3）流體的比容指的是單位質(zhì)量的流體所占有的體積，用v表示。顯然，它與密度互為倒數(shù)。山東快速接頭流體工具流體力學(xué)是在人類(lèi)同自然界作斗爭(zhēng)和在生產(chǎn)實(shí)踐中逐步發(fā)展起來(lái)的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山東快速接頭流體工具,流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847452978516/8672920.png"></div><p style="text-indent:25px">流體是與固體相對(duì)應(yīng)的物體形態(tài)，是液體和氣體的總稱(chēng)，它的基本特征是沒(méi)有一定形狀和具有流動(dòng)性。其流動(dòng)行為由粘度決定，粘度越低越容易流動(dòng)。流體在靜態(tài)時(shí)無(wú)磁性吸引力，當(dāng)外加磁場(chǎng)作用時(shí)，才表現(xiàn)出磁性，正因如此，它才在實(shí)際中有著多的應(yīng)用，在理論上具有很高的學(xué)術(shù)價(jià)值。用納米金屬及合金粉末生產(chǎn)的磁流體性能優(yōu)異，可多應(yīng)用于各種苛刻條件的磁性流體密封、減震、醫(yī)療器械、聲音調(diào)節(jié)、光顯示、磁流體選礦等領(lǐng)域。用磁流體代替液力偶合器中的液壓力，效果應(yīng)該會(huì)更好。</p><p style="text-indent:25px">20世紀(jì)初，飛機(jī)的出現(xiàn)極大地促進(jìn)了空氣動(dòng)力學(xué)的發(fā)展。航空事業(yè)的發(fā)展，期望能夠揭示飛行器周?chē)膲毫Ψ植?、飛行器的受力狀況和阻力等問(wèn)題，這就促進(jìn)了流體力學(xué)在實(shí)驗(yàn)和理論分析方面的發(fā)展。20世紀(jì)初，以儒科夫斯基、恰普雷金、普朗克等為表示的科學(xué)家，開(kāi)創(chuàng)了以無(wú)粘不可壓縮流**勢(shì)流理論為基礎(chǔ)的機(jī)翼理論，闡明了機(jī)翼怎樣會(huì)受到舉力，從而空氣能把很重的飛機(jī)托上天空。機(jī)翼理論的正確性，使人們重新認(rèn)識(shí)無(wú)粘流體的理論，肯定了它指導(dǎo)工程設(shè)計(jì)的重大意義。理想流體是液壓傳動(dòng)和氣壓傳動(dòng)的介質(zhì)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山東快速接頭流體工具,流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847512148438/8901706.png"></div><p style="text-indent:25px">流體的粘度，流體粘度在泵選型中是一個(gè)十分重要的參數(shù)。粘度影響著壓損的計(jì)算，泵的轉(zhuǎn)***率，功率等等。粘度是流體的物理特性，任何流體都有粘度。流體在流動(dòng)時(shí)，相鄰流體層間存在相對(duì)運(yùn)動(dòng)，流體層之間會(huì)產(chǎn)生摩擦阻力，成為粘滯力。粘度是用來(lái)衡量粘滯力大小的物理數(shù)據(jù)。粘度較低的，比如水，在管道中流動(dòng)比較順暢。想象***體的每個(gè)分子是個(gè)人形，粘度低的分子好比運(yùn)動(dòng)健將，流動(dòng)起來(lái)十分迅速。流體粘度高的，分子好比5年后的雷神，走不動(dòng)道，移動(dòng)起來(lái)十分緩慢。這時(shí)需要容積泵，好比推土機(jī)一樣硬性的推動(dòng)流體的前進(jìn)。另外液體粘度并不是固定的，通常會(huì)隨著溫度的升高而降低，隨著壓力的升高而增加。大氣和水是常見(jiàn)的兩種流體。山東快速接頭流體工具</p><p style="text-indent:25px">大氣包圍著整個(gè)地球，地球表面的70%是水面。山東快速接頭流體工具</p><p style="text-indent:25px">流體的黏性作用以及流動(dòng)中可能出現(xiàn)的激波，都使流動(dòng)產(chǎn)生機(jī)械能損耗并轉(zhuǎn)化為熱能，這是絕熱流動(dòng)所允許的，并將存在機(jī)械能損耗的絕熱流動(dòng)稱(chēng)為不可逆絕熱流動(dòng)。這兩個(gè)現(xiàn)象的共同點(diǎn)在于沒(méi)有外界的熱量輸入，而區(qū)別之處在于，前者可以認(rèn)為，黏性作用導(dǎo)致的機(jī)械能損耗轉(zhuǎn)化為熱能,屬于能量形式的轉(zhuǎn)化，尤其是可以證明機(jī)械能損耗與熱能生成這兩個(gè)過(guò)程（或能力）是近似同步（或相同）的，因此流體微團(tuán)具有的總能量不變化；后者則是既有黏性耗散使得機(jī)械能損耗轉(zhuǎn)化為熱能，也存在熱傳導(dǎo)效應(yīng)，但是由于流動(dòng)所涉及的空間尺度遠(yuǎn)大于熱傳導(dǎo)所涉及的空間尺度，通?？珊雎浴拔⑿　笨臻g尺度的熱傳導(dǎo)效應(yīng)，或?qū)⑵湟矚w結(jié)到能量轉(zhuǎn)化的范疇，因此宏觀流動(dòng)仍可看作是絕熱流動(dòng)。此外，流體微團(tuán)穿過(guò)激波后的總能量不變是可以得到證明的。山東快速接頭流體工具</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2844992.html</p></div></div></div></div></div><div id="3373flh" class="page-right twoColRt"><div id="jzpflr3" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="nbrplhf" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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