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采用有限差分法建立了高温钢板连续喷水冷却过程中一维非稳态传热条件下冷却水换热系数的计算模型,将试验测量到的数据应用该模型计算出了试验过程中冷却水与高温钢板间的换热系数h。分析结果表明:在流量一定的情况下,压力对换热系数的影响较明显,而在压力一定的情况下,流量对换热系数的影响较小,冷却水的换热系数随喷水密度的增加而增大,随钢板表面的温降呈先增加后减小的趋势。总结出了钢板表面温度为400~1 000℃,喷水密度为90~180 L/(m~2·min)的条件下,喷水冷却换热系数h的经验计算公式。
The finite difference method was used to establish the calculation model of the heat transfer coefficient of the cooling water under the condition of one-dimensional unsteady heat transfer during the continuous spray cooling of high temperature steel plate. The measured data were used to calculate the cooling water and Heat transfer coefficient between high-temperature steel h. The results show that the effect of pressure on the heat transfer coefficient is obvious under a certain flow rate, while the flow rate has little effect on the heat transfer coefficient under a certain pressure. The heat transfer coefficient of the cooling water varies with the spray density Increase and increase, with the steel surface temperature drop first increased and then decreased. The empirical formula for the heat transfer coefficient h of spray cooling under the conditions of a surface temperature of 400-1000 ℃ and a spray density of 90-180 L / (m ~ 2 · min) is summarized.