题目：Heat Transport in Turbulent Thermal Convection
主讲：Professor Quan Zhou (Shanghai Institute of Applied Mathematics and
Mechanics, Shanghai University)
时间：9月11日（星期四）15：00
地点：力学一楼239
内容简介:
Thermal convection is an efficient means to carry heat flux across space by
a moving fluid, and it is ubiquitous in nature. A classical model system to
study such phenomenon is Rayleigh-Bénard convection (RBC), i.e. the motion
of a fluid layer that is heated from below and cooled from above. Due to the
buoyancy instability the fluid moves and carries a heat flux upwards, which
is typically many times of that by thermal diffusion. An important question
to ask is how much heat flux moves through the RBC cell given an enclosed
fluid and an imposed temperature difference across the cell. This heat flux
is usually characterized by a non-dimensional parameter, defined as the
Nusselt number Nu, which depends largely on the control parameters of the
system, such as the Rayleigh number Ra, the Prandtl number Pr, and the
aspect ratio  of the convection cell. In this talk, I will introduce our
recent works on heat transfer problems, i.e. the dependence of Nu on (Ra, Pr,
). Especially, I will report an experimental and numerical study that
reveals a novel mechanism that leads to dramatically enhanced heat transport,
i.e. when partition walls are inserted into a convection cell with thin
gaps left open between the partition walls and the cooling/heating plates,
it is found that the convective flow becomes much more coherent and self-
organized, leading to a dramatically enhanced heat transport of up to 2.3
times that without any partitions. We expect that this surprising discovery
might bring profound changes in many industrial applications where thermal
flux through a fluid is involved.
个人简介：
周 全，男，博士，现任上海大学上海市应用数学和力学研究所研究员、博导。2003年于
中国科学技术大学获学士学位，2005年和2008年于香港中文大学分别获硕士和博士学位
。2012年获得国家自然科学基金委首届“优秀青年科学基金项目（优青）”资助，
2013年入选中共中央组织部首批“青年拔尖人才支持计划”，同年入选教育部“新世纪优秀人才支持计划”。多年来一直从事流体力学方
面的科学研究，已在相关研究领域共发表SCI论文20余篇。目前的研究兴趣有：实验流体
力学、Rayleigh-Bénard热对流和Rayleigh-Taylor湍流。
E-mail: qzhou@shu.edu.cn
Homepage: http://my.shu.edu.cn/cn/qzhou
主讲：Professor Quan Zhou (Shanghai Institute of Applied Mathematics and
Mechanics, Shanghai University)
时间：9月11日（星期四）15：00
地点：力学一楼239
内容简介:
Thermal convection is an efficient means to carry heat flux across space by
a moving fluid, and it is ubiquitous in nature. A classical model system to
study such phenomenon is Rayleigh-Bénard convection (RBC), i.e. the motion
of a fluid layer that is heated from below and cooled from above. Due to the
buoyancy instability the fluid moves and carries a heat flux upwards, which
is typically many times of that by thermal diffusion. An important question
to ask is how much heat flux moves through the RBC cell given an enclosed
fluid and an imposed temperature difference across the cell. This heat flux
is usually characterized by a non-dimensional parameter, defined as the
Nusselt number Nu, which depends largely on the control parameters of the
system, such as the Rayleigh number Ra, the Prandtl number Pr, and the
aspect ratio  of the convection cell. In this talk, I will introduce our
recent works on heat transfer problems, i.e. the dependence of Nu on (Ra, Pr,
). Especially, I will report an experimental and numerical study that
reveals a novel mechanism that leads to dramatically enhanced heat transport,
i.e. when partition walls are inserted into a convection cell with thin
gaps left open between the partition walls and the cooling/heating plates,
it is found that the convective flow becomes much more coherent and self-
organized, leading to a dramatically enhanced heat transport of up to 2.3
times that without any partitions. We expect that this surprising discovery
might bring profound changes in many industrial applications where thermal
flux through a fluid is involved.
个人简介：
周 全，男，博士，现任上海大学上海市应用数学和力学研究所研究员、博导。2003年于
中国科学技术大学获学士学位，2005年和2008年于香港中文大学分别获硕士和博士学位
。2012年获得国家自然科学基金委首届“优秀青年科学基金项目（优青）”资助，
2013年入选中共中央组织部首批“青年拔尖人才支持计划”，同年入选教育部“新世纪优秀人才支持计划”。多年来一直从事流体力学方
面的科学研究，已在相关研究领域共发表SCI论文20余篇。目前的研究兴趣有：实验流体
力学、Rayleigh-Bénard热对流和Rayleigh-Taylor湍流。
E-mail: qzhou@shu.edu.cn
Homepage: http://my.shu.edu.cn/cn/qzhou