
污垢熱阻;防垢性;水生物沉積抵抗率
The effects of fluid velocity, particle diameter, and bulk particle concentration on the asymptotic fouling resistance were also stu***d.
考察了顆粒質量分數、顆粒直徑和流體速度對漸近污垢熱阻的影響。
The variation of fouling resistance and frictional resistance coefficient of heat exchanger using connate Yangtze River water as cooling water is tested experimentally.
通過實驗方法測試了以原生長江水為冷卻水的換熱器污垢熱阻和摩阻系數的變化。
The relationship between fouling and heat exchanging was discussed, and the performance of this system with the change of fouling thermal resistance was simulated.
讨論污垢與換熱的理論關系,并詳細模拟污垢熱阻變化對該污水源熱泵系統性能的影響。
The distribution of filtration resistance was accounted during experiment, and harnessing measure of fouling of membrane was also stu***d.
通過實驗計算了自生生物動态膜過濾阻力的分布,并研究了膜污染防治措施。
Little compound scale inhibitor into the solution can make fouling thermal resistance decrease extraordinarily, and the scale inhibition rate can reach to about 98%.
成垢溶液添加複合阻垢劑之後,污垢熱阻大為減小,阻垢率達到98%左右。
在熱力學和傳熱工程領域,"fouling resistance"(污垢熱阻)是指由于設備表面沉積污染物導緻的傳熱效率降低現象。該參數通常用符號$R_f$表示,其計算式為:
$$ Rf = frac{1}{U{dirty}} - frac{1}{U_{clean}} $$
式中$U{dirty}$和$U{clean}$分别代表設備污染狀态和清潔狀态下的總傳熱系數。這個參數直接影響換熱器、冷凝器等工業設備的運行效能,國際傳熱協會(International Centre for Heat and Mass Transfer)将其列為設備維護的關鍵指标。
主要形成機理包含四種類型:結晶污垢(如碳酸鈣析出)、生物污垢(微生物膜形成)、化學反應污垢(氧化腐蝕産物)以及顆粒沉積(粉塵堆積)。美國機械工程師協會(ASME)标準指出,生物污垢在冷卻水系統中的熱阻貢獻率可達總阻力的30%以上。
實際工程應用中,污垢熱阻的預測與監測對設備壽命和能耗控制至關重要。根據《傳熱學基礎》(Fundamentals of Heat Exchanger Design)教材數據,典型的管殼式換熱器污垢熱阻值範圍在0.0001到0.002 m²·K/W之間,具體數值取決于流體性質和運行工況。
International Centre for Heat and Mass Transfer技術報告
ASME标準PTC 12.5-2022
《Fundamentals of Heat Exchanger Design》第7章
“Fouling resistance”是工程和物理學中的專業術語,結合“fouling”和“resistance”的雙重含義,具體解釋如下:
在工程領域,fouling resistance(污垢熱阻)特指污垢層對熱傳導效率的影響。其計算公式為: $$ R_f = frac{delta}{lambda} $$ 其中:
污垢熱阻越大,設備(如冷凝器)的傳熱效率越低,可能導緻能耗增加或設備壽命縮短。
在非技術語境中,可能泛指“抗污染能力”,如濾網的抗污垢性能。
如需具體領域的擴展(如熱力學公式推導),可進一步說明。
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