采用热辐射直接加热液滴群是海水淡化、光热储能、碳捕集等领域耦合太阳能、实现绿色生产的关键技术。基于几何光学以及热辐射传输理论,针对外部热辐射加热下液滴群内的辐射传递过程建立计算模型。选取棋盘型、棋盘交错型、扇形、随机型4种液滴群空间构型,在液滴吸收系数为1~1000 m-1、粒径为0.1~1 mm、折射率为1.1~2.0、相对分布密度为0.006~0.461范围内计算分析液滴群对外部辐射的吸收距离、平均升温速率和总体吸收率等吸收性能随液滴群辐射参数和几何参数的变化规律。结果表明：在热辐射加热液滴群的应用中,将液相充分雾化、提高液滴群分布密度、吸收系数的同时适当提高折射率是同步实现快速、高效加热液滴群的有效途径。
Abstract
Direct heating of water droplets by thermal radiation is the key process in incorporating solar energy to achieve green production in many industrial applications, such as desalination, solar energy storage and carbon capture. A calculation model based on geometrical optics and thermal radiation transfer theory is established for radiative transfer process among droplets under incidence of external radiation. Four distributions of drops, such as chessboard, staggered chessboard, sector, as well as random are selected. According to which, drops’ radiation absorption characteristics （absorption distance, mean temperature increase rate, absorption rate） are studied in conditions of absorption coefficient ranging from 1 to 1000 m-1, droplet diameter ranging from 0.1 to 1 mm, refractive index ranging from 1.1 to 2.0 and distribution density ranging from 0.006 to 0.461. Results suggest that fast and efficiently heat up of drops could be realized simultaneously through raising absorption coefficient, increasing distribution density by further atomization, and appropriately enhancing refractive index at the same time.
关键词
辐射 /
吸收 /
液滴群 /
升温速率 /
液滴群分布
Key words
radiation /
absorption /
drops /
temperature increase rate /
drops’ distribution;
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