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SimSun;">3. 3</span></span></a><span class="61pt" style="line-height: 14pt; background-color: transparent;">轴承的热传递</span></p> <p class="691" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:8.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:26.0pt;line-height:23.05pt;mso-line-height-rule:exactly;background: transparent"><span class="69">关于轴承热量主要来自摩擦，其中热量的传递是三种基本形式：热对流、热传导、 和热辐射。与传导热和对流热相比，辐射热影响很小，分析和计算时，忽略其大小。 轴承的热量传递是空间三维问题，实际情况非常复杂。为了分析，做了下列简化假设:</span></p> <p class="691" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:15.0pt;margin-bottom:.0001pt;text-indent:0cm;line-height:23.05pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;background:transparent"><!--[if !supportLists]--><span style="font-family: SimSun;">(1)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="69">热量传递是稳态过程；</span><span class="69">（</span><span class="69"><span style="font-family: SimSun;">2)</span></span><span class="69">只考虑沿膜厚方向的温度分布。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:5.8pt; margin-left:8.0pt;text-indent:0cm;line-height:23.05pt;mso-line-height-rule: exactly;background:transparent"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="2"><span style="font-family: SimSun;">3. 3. </span></span><span class="2">1</span></st1:chsdate><span class="2115pt1"><span style="font-size: 11.5pt;">热传导</span></span></p> <p class="691" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:8.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span class="69">导热为热传导的简称。一个物体不同部分的温度不同或温度有差异的两个物体相 互接触时，物体保持无任何相对运动时，物体内部的各种微观粒子伴随着热量发生相 互运动，利用这种运动传递热能的现象叫热传导。当物质内部的温度有差异时，会发 生能量转移。<o:p></o:p></span></p> <p class="691" style="margin-top:0cm;margin-right:0cm;margin-bottom:7.9pt; margin-left:0cm;text-align:justify;text-justify:inter-ideograph;text-indent: 0cm;line-height:11.5pt;mso-line-height-rule:exactly;mso-list:l1 level1 lfo2; tab-stops:17.7pt;background:transparent"><!--[if !supportLists]--><span style="font-size: 11pt; font-family: SimSun;">3.<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="69"><span style="font-family: SimSun;">3. </span></span><span class="691pt">2热对流</span></p> <p class="691" style="margin-bottom:0cm;margin-bottom:.0001pt;text-indent:26.0pt; line-height:23.3pt;mso-line-height-rule:exactly;background:transparent"><span class="69">具有温度差异的物体在流体中有相对移动时，会伴随热能的转移，此种能量的传 递叫做热对流。在不经过机械设备改变的前提下，冷然程度不同或密度有差异的流体 会发生相对运动时，热量发生转移此过程叫做自然对流；如果因为水泵、风机的机械 外力作用或其他外界强迫性的作用而使流体发生相对运动，则此种现象叫做强迫对流 (或强制对流）。对流只在流体中存在，有对流现象的流体中的粒子同时也进行着不 规则的热运动，所以实际上热对流一定有导热现象发生，此时的热能传递是一种繁复 非单一的过程。现实生活中经常会发现流体与具有温度差异的固体表面发生的热能转 移，此种热能的转移叫做对流换热。</span></p> <p class="691" style="margin-bottom:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule: exactly;background:transparent"><span class="69">对流换热过程可分为两种：一种是发生相变的对流换热，例如液体沸腾和蒸汽凝 结；另一种是相态不发生变化的对流换热。对流换热是一种繁复的热能传递过程，实 际上对流换热的影响因素颇多，对于不同介质和物体间的对流换热，根本计算公式是 从牛顿在1702年推导出的冷却定律（又称作冷却公式）中得出的。<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" style="font-size:1.0pt;mso-fareast-font-family: 宋体;mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> <p class="MsoNormal"><span lang="EN-US" style="font-size:1.0pt;mso-fareast-font-family: 宋体;mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span><span style="font-family: 宋体; font-size: 9pt;">本文采摘自“数控加工中心主轴轴承油气润滑机理研究”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span></p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>数控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E6%95%B0%E6%8E%A7%E6%9C%BA%E5%BA%8A' target='_blank'>数控机床</a> <a href='/index.php?case=tag&act=show&tag=%E4%B8%BB%E8%BD%B4' target='_blank'>主轴</a> <a href='/index.php?case=tag&act=show&tag=%E8%BD%B4%E6%89%BF' target='_blank'>轴承</a> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div 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