Investigation of heat transfer coefficient during quenching in various cooling agents
Investigation of heat transfer coefficient during quenching in various cooling agents
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DOI：
10.1016/j.ijheatfluidflow.2013.07.004
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发表时间：
2013-12-01
影响因子：
2.6
通讯作者：
Telejko, T.
中科院分区：
文献类型：
--
作者：
Buczek, A.;Telejko, T.
用数值方法测量和评价了浸入淬火过程中金属试样表面的传热系数。定义并求解了边界热传导反问题。用自行编制的有限元计算程序对正问题进行了求解。该方法的灵敏度，使我们能够检查两种矿物油和聚合物淬火剂的热传递的各种淬火参数的效果。在800 ℃时，对于矿物油和聚合物冷却剂，HTC值分别等于或接近0.5 kW/（m（2）K）和3.2 kW/（m（2）K）。它们分别增加到类似于4.7 kW/（m（2）K）-油A、类似于6.0 kW/（m（2）K）-油B和类似于7.4 kW/（m（2）K）-聚合物。对于油，HTC的峰是尖锐的，并且发生在520和550 ° C之间的窄温度间隔处，而对于聚合物，峰低约100 ° C。100 K和平坦超过100-120 K区间。随后HTC降低，并且在类似于150摄氏度的温度下，对于矿物油和水聚合物冷却剂，该值分别类似于0.5 kW/（m（2）K）和2.0 kW/（m（2）K）。(C)2013 Elsevier Inc. All rights reserved.
Heat transfer coefficients, HTCs, at the surface of a metal sample during immersion quenching were measured and evaluated using numerical procedures. The boundary inverse heat conduction problem has been defined and solved. A FEM self-developed computer code has been used to obtain a solution to the direct problem. The sensitivity of the method enabled us to examine the effect of various quenching parameters on the heat transfer for two mineral oils and a polymer quenchant. At 800 degrees C the HTC values were equal to similar to 0.5 kW/(m(2) K) and similar to 3.2 kW/(m(2) K), for mineral oils and a polymer coolant, respectively. They increased to similar to 4.7 kW/(m(2) K) - oil A, similar to 6.0 kW/(m(2) K) - oil B and similar to 7.4 kW/(m(2) K) - polymer, respectively. The peak of HTC was sharp and occurred at a narrow temperature interval between 520 and 550 degrees C for the oils, whereas for the polymer, the peak was lower by approx. 100 K and flat over 100-120 K interval. Subsequently HTC decreased, and at similar to 150 degrees C the values were similar to 0.5 kW/(m(2) K) and similar to 2.0 kW/(m(2) K), for mineral oils and a water polymer coolant, respectively. (C) 2013 Elsevier Inc. All rights reserved.