摘要：Jet impingement quenching heat transfer of LN2 on rock surface was experimentally investigated. The test plate was circular in shape and was 16 cm in diameter and 2 cm in thickness. An aluminum alloy specimen with the same configuration as the rock plate was also used to highlight the characteristics of rock material in affecting the LN2 jet impingement boiling heat transfer. Comparing to the aluminum, rock has a low thermal conductivity and the rock surface was distributed with micro pores and cavities. This surface character enabled a 100 degrees C increase of the rewetting temperature. An attempt was made to quantitatively explain the rewetting temperature enhancement using the local cold spot theory. The stagnation point on rock surface was directly wetted by LN2 jet without film boiling, for which the high rewetting temperature and fast temperature drop were proposed as the reasons. The maximum heat flux and wetting front velocity were investigated for both quenching samples and the results were compared to correlations in the literature.

关键字：Jet impingement boiling Liquid nitrogen Rock Quenching

ISSN号：0894-1777

卷、期、页：卷: 106 页: 255-264

发表日期：2019-09-01

影响因子：2.830000

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）,EI（工程索引）

发表期刊名称：Experimental Thermal and Fluid Science

通讯作者：李冉,武晓光

第一作者：黄中伟

论文类型：期刊论文

论文概要：李冉,武晓光,黄中伟，Jet impingement boiling heat transfer from rock to liquid nitrogen during cryogenic quenching，Experimental Thermal and Fluid Science，2019，卷: 106 页: 255-264

论文题目：Jet impingement boiling heat transfer from rock to liquid nitrogen during cryogenic quenching