作者:admin 日期:2023-11-12 08:01:11 浏览:55 分类:生活
水的导热系数随温度变化而有所变化: 0℃:0.55w/m.k;4℃:0.58w/m.k;20℃:0.599w/m.k 100℃:0.683w/m.k。
在常温常压下,液态水的导热系数约为0.59W/(m·K)。对于同一种物质来说导热系数与其结构、密度、湿度、温度、压力等因素有关。同一物质的含水率低、温度较低时,导热系数较小。
在同样的温度下,水的导热系数却为大约0.59W/(m·℃),我们可以清楚地看到,水的传热能力远远超出空气。这也是为什么30℃的气温会让人觉得热,而30℃的水却让人感到冷了。
水在30℃导热系数λ为0.62W/m·K。不同物质导热系数各不相同;相同物质的导热系数与其的结构、密度、湿度、温度、压力等因素有关。同一物质的含水率低、温度较低时,导热系数较小。
根据中国建筑工业出版社出版的《简明施工计算手册(第二版)》江正荣、朱国梁编著的数据:水在4℃时的导热系数为0.58瓦每米开尔文。材料直接传导热量的能力称为热传导率,或称热导率。
1、铁瓷木头塑料 把这几种物体弄成相同长度厚薄,再放在同样高的热度下,过几分钟取出用手摸。
2、导热系数由大到小排列应为:铁瓷木头塑料。(有个简单的比较不同材料传热性能的方法:两个温度一样的不同材料,用两只手同时接触不同的材料,哪只手感觉更凉快,相应的材料的传热性能更好。
3、铁和木头这两种常见材料导热系数相差很大的, 铁的是 60-70 W/m.K;而木头的只有0.2W/m.K左右,所以铁的导热性比木头的导热性强很多。
4、将三种材料的一头都插入水中,另一头在空气里,测量另一头的温度,记录温度随时间变化的曲线。
1、【答案】:正确材料的导热系数随温度的升高而增大,因为温度升高时,材料固体分子的热运动增强,同时材料孔隙中空气的导热和孔壁间的辐射作用也有所增加。
2、这是因为在高温下,分子的振动和相互碰撞变得更加剧烈,导致物质的结构发生变化,从而导致热传导性质发生变化。
3、固体热导率的普遍形式: 在温度不太高时,材料中主要以声子热导为主,决定热导率的因素有材料的热容C、声子的平均速度V和声子的平均自由程L,其中v通常可以看作常数,只有在温度较高时,介质的弹性模量下降导致V减小。
4、热导率一般与压力关系不大,但受温度的影响很大。纯金属和大多数液体的热导率随温度的升高而降低,但水例外;非金属和气体的热导率随温度的升高而增大。
5、在不良导体热导率的测量实验中,可能存在以下几种误差来源: 传热流失:在实际测量中,热量可能会通过实验装置或其他非目标物质的路径流失,导致测量结果偏低。
1、物质的性质:不同物质的热导率不同,例如金属的热导率通常较高。温度:随着温度的升高,物质的热导率通常也会增加。密度:密度较大的物质通常具有更高的热导率。
2、影响热导率的因素有温度梯度、材料的性质以及热量所遵循的路径长度。热导率的意思:热导率,又称“导热系数”。是物质导热能力的量度。符号为λ或K。英文:coefficient of thermal conductivity。
3、影响热传导的因素有温度差、导热系数、导热物的截面积、时间、导热物厚度。材料的导热系数不但因物质的种类而异,而且还和材料的温度、湿度、压力和密度等因素有关,而影响导热系数主要因素是材料的密度和湿度。
4、材料的温度。是导热依靠材料中的电子,原子,分子和晶格热运动来传递热量。但材料性质不同,其主要导热机理不同,效果也不一样。一般来说,金属的热导率大于非金属,纯金属热导率大于合金。
5、影响因素:不同物质的导热系数各不相同;相同物质的导热系数与它的结构、湿度、密度、压力、温度等因素有关。同一种物质的温度较低、含水率低时,导热系数小。一般来说,固体的热导率比液体的大,而液体的又比气体的大。
6、与材料性质有关。导热是依靠材料中的电子、原子、分子和晶格热运动来传递热量。但材料性质不同,其主要导热机理不同,效果也不一样。一般来说,金属的热导率大于非金属,纯金属热导率大于合金。
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