To address severe heat hazards and low cooling efficiency in deep mining faces, this study is based on a localized head–neck cooling strategy of a jet in ventilation-induced crossflow (JVIC). The spatial and thermal performance requirements of the approach are analyzed, and dimensionless control parameters are derived. A spatial parameter—jet freedom degree (F)—is proposed. Vortex structures and heat transfer characteristics are examined through wind tunnel experiments and numerical simulations. The effects of F, velocity ratio (R), and orifice ratio (C) on the effective temperature envelope and cooling efficiency are investigated. The envelope is divided into three segments: initial segment Ld, effective segment Le, and trailing segment Lv, along with two key performance indicators: effective cooling rate (η1) and cooling diffusion efficiency (η2). The results reveal that spatial overlap between the counter-rotating vortex pair (CVP) and the effective cooling area is the core objective of airflow control. When using a “small R and small C”, the envelope length can reach up to 7 times the jet space height (dm). For F = 1, efficient cooling requires highly deflected wall-attached jets, while for F = 1.25, 1.5, medium and low deflection jets are more effective. Highly deflected wall-attached jets demonstrate the highest η1 and η2, indicating superior cooling performance. Increasing the jet temperature (tj) results in a shorter envelope length. This study provides theoretical insights and design guidelines for the development of efficient cooling systems in high-heat-load mining environments.
Wáng et al. (Mon,) studied this question.