
污垢热阻;防垢性;水生物沉积抵抗率
The effects of fluid velocity, particle diameter, and bulk particle concentration on the asymptotic fouling resistance were also stu***d.
考察了颗粒质量分数、颗粒直径和流体速度对渐近污垢热阻的影响。
The variation of fouling resistance and frictional resistance coefficient of heat exchanger using connate Yangtze River water as cooling water is tested experimentally.
通过实验方法测试了以原生长江水为冷却水的换热器污垢热阻和摩阻系数的变化。
The relationship between fouling and heat exchanging was discussed, and the performance of this system with the change of fouling thermal resistance was simulated.
讨论污垢与换热的理论关系,并详细模拟污垢热阻变化对该污水源热泵系统性能的影响。
The distribution of filtration resistance was accounted during experiment, and harnessing measure of fouling of membrane was also stu***d.
通过实验计算了自生生物动态膜过滤阻力的分布,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%.
成垢溶液添加复合阻垢剂之后,污垢热阻大为减小,阻垢率达到98%左右。
在热力学和传热工程领域,"fouling resistance"(污垢热阻)是指由于设备表面沉积污染物导致的传热效率降低现象。该参数通常用符号$R_f$表示,其计算式为:
$$ Rf = frac{1}{U{dirty}} - frac{1}{U_{clean}} $$
式中$U{dirty}$和$U{clean}$分别代表设备污染状态和清洁状态下的总传热系数。这个参数直接影响换热器、冷凝器等工业设备的运行效能,国际传热协会(International Centre for Heat and Mass Transfer)将其列为设备维护的关键指标。
主要形成机理包含四种类型:结晶污垢(如碳酸钙析出)、生物污垢(微生物膜形成)、化学反应污垢(氧化腐蚀产物)以及颗粒沉积(粉尘堆积)。美国机械工程师协会(ASME)标准指出,生物污垢在冷却水系统中的热阻贡献率可达总阻力的30%以上。
实际工程应用中,污垢热阻的预测与监测对设备寿命和能耗控制至关重要。根据《传热学基础》(Fundamentals of Heat Exchanger Design)教材数据,典型的管壳式换热器污垢热阻值范围在0.0001到0.002 m²·K/W之间,具体数值取决于流体性质和运行工况。
International Centre for Heat and Mass Transfer技术报告
ASME标准PTC 12.5-2022
《Fundamentals of Heat Exchanger Design》第7章
“Fouling resistance”是工程和物理学中的专业术语,结合“fouling”和“resistance”的双重含义,具体解释如下:
在工程领域,fouling resistance(污垢热阻)特指污垢层对热传导效率的影响。其计算公式为: $$ R_f = frac{delta}{lambda} $$ 其中:
污垢热阻越大,设备(如冷凝器)的传热效率越低,可能导致能耗增加或设备寿命缩短。
在非技术语境中,可能泛指“抗污染能力”,如滤网的抗污垢性能。
如需具体领域的扩展(如热力学公式推导),可进一步说明。
meatballput awayhear aboutcureoverheadmoonlightmerge intobounce boutByzantineastrictionglaredmousesunrelatedby courtesyearthen potpreventive maintenanceshrimp meatwither awayacclimationaphasisbeemasterblunderbusscoelogastrulademultiplexingdienefoxholefritillinegratinglyhyperchimaerahydrograph