測(cè)定空氣的導(dǎo)熱系數(shù)報(bào)告

1、測(cè)定干燥空氣的導(dǎo)熱系數(shù)五、數(shù)據(jù)記錄及處理1實(shí)驗(yàn)條件(1)測(cè)量室參數(shù)：熱線長(zhǎng)度：l=18.10cm熱線0c時(shí)電阻值& =40.53熱線直徑Di =0.0192mm測(cè)量室內(nèi)直徑 D2=15.22mm實(shí)驗(yàn)室參數(shù)：室溫 t2 =32.5 0cT2=273.15+32.5=305.6K3油建汨序,Rt Ro=99.7 40.5359.2 10淖4。熱線溫度t1。5.1 10 3 40.53207286 CRo20 U273.15 286559K(R99.7R 99.70.2 )2、數(shù)據(jù)記錄(kpa)(v)(mA)(W)UI P真空(W)(W)0 (真3.9039.10.1520.00099.720.10

2、007.6276.80.5800.4340.5201.001.9599.120.15008.3984.30.7070.5550.6660.6671.5099.500.20008.9389.60.8000.6480.7780.5001.2999.700.25009.3193.60.8710.7190.863 10.4031.1899.400.30009.6997.30.9460.7910.9490.3381.0299.400.35009.98100.00.9980.8461.020.2860.98599.810.400010.25102.51.0530.9051.060.2520.92899.8

3、10.4500、10.45104.51.0960.9361.1600.2260.88999.800.500010.62106.51.1310.9791.1700.2000.85199.700.55001 10.80108.01.1701.0181.2210.1820.81999.860.600010.96109.81.2031.0511.2610.1660.79299.820.650011.08110.91.2291.0771.2920.1540.77399.900.700011.19112.11.2541.1021.3220.1430.75699.820.750011.31113.21.28

4、01.1281.3540.1330.73999.910.800011.41114.11.3041.1521.3820.1250.72499.820.850011.49115.11.3221.1701.4040.1180.71399.820.900011.58116.01.3431.1911.4290.1110.70199.800.950011.70116.41.3611.2121.4540.1050.68899.811.000011.78117.81.3861.2301.4770.1000.67899.833、數(shù)據(jù)處理(1)處理 1:0920 1 w因?yàn)镵 K32/273.15近似成立（查表可

5、得Ko則至T2間的平均與熱系數(shù)測(cè)量百分差：Epi KJ 44 4&8.5%六、實(shí)驗(yàn)結(jié)果討論及誤差分析:1、從百分差計(jì)算中可知：用外推法求Q時(shí)，連線照顧氣壓較低的點(diǎn)太多，應(yīng)該連線取5lOmmHg上的測(cè)量點(diǎn)為主。2、 雖然Ea百分差較小，但也存在一定的誤差，其主要原因是壓強(qiáng)計(jì)在某一壓強(qiáng)壓強(qiáng)計(jì)數(shù)時(shí),其對(duì)應(yīng)的U和I還有一個(gè)變動(dòng)區(qū)間。3、。低的修正值是否一定是1.2系數(shù)，在外界溫度不同條件下是否該系數(shù)會(huì)變。 t34、平均導(dǎo)熱系數(shù)的理論值是否科學(xué)、可靠，因?yàn)镵 Kop273 i5 2只是近似成立。七、注目點(diǎn)：1、 儀器中的抽氣閥在真空泵停止工作時(shí)，一定要將抽氣閥旋止“大氣”位置，否則回油，損壞測(cè)量室。2、漏氣