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id="i3kgim8" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847458974609/1170994.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3zdkwnh" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</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>江蘇快速接頭流體控制,流體</p><p><span>***更新：</span>2021-01-15 00:19:23</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="3covcov" 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="87gnpw8" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="dmoahyp" class="box"><p><p style="text-indent:25px">流體的流動形式也有區(qū)分。倘流速很慢，流體會分層流動，互不混合，此乃層流。倘流速增加，越來越快，流體開始出波動性擺動，此情況稱之為過渡流。當(dāng)流速繼續(xù)增加，江蘇快速接頭流體控制，達(dá)到流線不能清楚分辨，會出現(xiàn)很多漩渦，這便是湍流，又稱作亂流、擾流或紊流。自由液面與液體相比氣體更容易變形，因?yàn)闅怏w分子比液體分子稀疏得多。在一定條件下，氣體和液體的分子大小并無明顯差異，江蘇快速接頭流體控制，江蘇快速接頭流體控制，但氣體所占的體積是同質(zhì)量液體的103倍。所以氣體的分子距與液體相比要大得多，分子間的引力非常微小，分子可以自由運(yùn)動，極易變形，能夠充滿所能到達(dá)的全部空間。流體靜止?fàn)顟B(tài)下其作用面上*能夠承受法向應(yīng)力。江蘇快速接頭流體控制</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江蘇快速接頭流體控制,流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847458974609/1170994.png"></div><p style="text-indent:25px">自古以來人們就知道在流體中運(yùn)動的物體會受到阻力作用，且阻力與物體形狀密切相關(guān)。但初的流體力學(xué)理論卻得出了相反的結(jié)論?；跉W拉和伯努利的流體運(yùn)動定律，如果忽略流體的黏性，則流體對在其中運(yùn)動的任何形狀的物體都不產(chǎn)生阻力作用?？磥碜枇ν耆丘ば援a(chǎn)生的了，但空氣的黏性非常小，其產(chǎn)生的摩擦阻力比實(shí)際測量得到的氣動阻力要小很多。這個矛盾在歷史上稱為“達(dá)朗貝爾佯謬”，因?yàn)槭怯煞▏鴶?shù)學(xué)家達(dá)朗貝爾提出的。直到普朗特提出了邊界層理論，人們才真正認(rèn)識到了流動阻力的實(shí)質(zhì)。壓差阻力才是氣動阻力的主要組成部分，而對于一般的物體，壓差阻力則主要是由于邊界層分離產(chǎn)生的。江蘇快速接頭流體控制忽略導(dǎo)熱性的流體（流動）稱為絕熱流體（流動）。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江蘇快速接頭流體控制,流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847473994141/8668307.png"></div><p style="text-indent:25px">流體力學(xué)是在人類同自然界作斗爭和在生產(chǎn)實(shí)踐中逐步發(fā)展起來的。古時中國有大禹治水疏通江河的傳說;秦朝李冰父子帶領(lǐng)勞動人民修建的都江堰，至今還在發(fā)揮著作用;大約與此同時，古羅馬人建成了大規(guī)模的供水管道系統(tǒng)等等。液體的分子距很小，分子間的引力較大，分子間相互制約，分子可以作無一定周期和頻率的振動，在其他分子間移動，但不能像氣體分子那樣自由移動，因此，液體的流動性不如氣體。在一定條件下，一定質(zhì)量的液體有一定的體積，并取容器的形狀，但不能像氣體那樣充滿所能達(dá)到的全部空間。液體和氣體的交界面稱為自由液面。</p><p style="text-indent:25px">流體力學(xué)有一些基本假設(shè)，基本假設(shè)以方程的形式表示。例如，在三維的不可壓縮流體中，質(zhì)量守恒的假設(shè)的方程如下:在任意封閉曲面(例如球體)中，由曲面進(jìn)入封閉曲面內(nèi)的質(zhì)量速率，需和由曲面離開封閉曲面內(nèi)的質(zhì)量速率相等。(換句話說，曲面內(nèi)的質(zhì)量為定值，曲面外的質(zhì)量也是定值)以上方程可以用曲面上的積分式表示。歐拉方法，其著眼點(diǎn)不是流體質(zhì)點(diǎn)，而是空間點(diǎn)，設(shè)法在空間中的每一點(diǎn)上描述出流體運(yùn)動隨時間的變化狀況。流體力學(xué)假設(shè)所有流體滿足以下的假設(shè):質(zhì)量守恒；動量守恒；連續(xù)體假設(shè)。流體融入到字體設(shè)計當(dāng)中去，成為字體中的流體設(shè)計。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江蘇快速接頭流體控制,流體" src="https://tyunfile.71360.com/UploadFile/shanghaimaihe/637382847491845703/4410210.png"></div><p style="text-indent:25px">界面流體的意義: 界面流體的意義不只是在美觀層度上滿足用戶，在閱讀體驗(yàn)上也給用戶帶來更多的趣味和可讀性，其實(shí)我覺得可以拿音樂來解釋，如果只是同一音階發(fā)聲，那就不能稱為音樂，那是聲音。音樂是不固定的音階而組成的，所以它是可以帶來趣味的。界面的流體也是如此，不同的閱讀長度和寬度帶來更加豐富的視覺。這點(diǎn)也可以幫助初學(xué)設(shè)計師提供一定的設(shè)計方向。 Banner的流體: banner是界面常見視覺點(diǎn)，主要能用到的流體點(diǎn)可能就是背景了，現(xiàn)商業(yè)的banner常常用到流體的背景圖形。還有個點(diǎn)就是banner中的一些漂浮的元素也可以用到流體。流體是由大量的、不斷地作熱運(yùn)動而且無固定平衡位置的分子構(gòu)成的。江蘇快速接頭流體控制</p><p style="text-indent:25px">流體在外力（主要是壓力）作用下，其體積或密度發(fā)生變化的性質(zhì)，又稱體積彈性。江蘇快速接頭流體控制</p><p style="text-indent:25px">高分子聚合物的濃溶液和懸浮液等一般為非牛頓流體。聚乙烯、聚丙烯酰胺、聚氯乙烯、尼龍6、PVS、賽璐珞、滌綸、橡膠溶液、各種工程塑料、化纖的熔體、溶液等，都是非牛頓流體。石油、泥漿、水煤漿、陶瓷漿、紙漿、油漆、油墨、牙膏、家蠶絲再生溶液、鉆井用的洗井液和完井液、磁漿、某些感光材料的涂液、泡沫、液晶、高含沙水流、泥石流、地幔等也都是非牛頓流體。食品工業(yè)中的番茄汁、淀粉液、蛋清、蘋果漿、濃糖水、醬油、果醬、煉乳、瓊脂、土豆?jié){、熔化巧克力、面團(tuán)、米粉團(tuán)、以及魚糜、肉糜等各種糜狀食品物料也都是非牛頓流體。江蘇快速接頭流體控制</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2846541.html</p></div></div></div></div></div><div id="qpgi8tk" class="page-right twoColRt"><div id="iceq97c" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="f2krq2w" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" 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