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loveiversion鐵蟲 (正式寫手)
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[求助]
熱擴(kuò)散率和導(dǎo)熱系數(shù)的換算 已有1人參與
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在傳熱分析中,熱擴(kuò)散率a(單位是m^2/s)是熱導(dǎo)率λ與比熱容c和密度ρ的乘積之比。 a=λ/(ρ·c) 其中:熱導(dǎo)率λ(單位:W/(m·K)) 比熱容c(單位:J/(kg·K)) 密度ρ(單位:kg/(m^3))。 我在實(shí)際換算中利用已知的熱擴(kuò)散率、密度和比熱求熱導(dǎo)率,合金的密度是4000kg/m3,比熱也是3個(gè)數(shù)量級(jí),大約2000J/(kg·K),熱擴(kuò)散率為個(gè)位數(shù),熱導(dǎo)率λ=a*ρ*c,結(jié)果為6-7個(gè)數(shù)量級(jí),實(shí)際金屬熱導(dǎo)率不超過100,那么兩者的換算到底哪里出了問題呢? |

木蟲之王 (文學(xué)泰斗)
peterflyer
鐵蟲 (正式寫手)
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鈦鋁合金,可能是文獻(xiàn)的問題。 文獻(xiàn)原文:The thermal-diffusivity measurements were carried out as a round-robin exercise between NPL and KTH. Both labs used the laser-flash method (NPL: Netzsch 475, KTH: Shinku-Riko, TC-7000H/MELT). The heating and cooling rates were 10 and 6K·minㄢ, respectively. The thermal diffusivity was measured in the solid phase from room temperature to 1,300Con heating and cooling, and is shown in Fig. 4. Full circles represent the measurement results in the heating cycle, and open circles represent the results for the cooling cycle. The results are fitted with a third-order polynomial, and the average between heating and cooling is taken as the recommended value: α= 3.01 × 109T 3 4.30 × 107T 2 + 5.18 × 103T + 5.36 (20C < T < 1300C) |

新蟲 (初入文壇)
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