林文贤
主要研究领域为浮力射流和自然对流的直接数值模拟，太阳能热利用技术，太阳能储热材料，太阳辐射分布等。
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 姓名：林文贤
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学科领域：
动力与电气工程
 研究兴趣：主要研究领域为浮力射流和自然对流的直接数值模拟，太阳能热利用技术，太阳能储热材料，太阳辐射分布等。
林文贤教授，男，湖北麻城人，64年2月生，博士，博士生导师，云南省高等学校特聘教授，云南省中青年学术和技术带头人，教育部“新世纪优秀人才支持计划”首批入选者，云南师范大学太阳能研究所教授。理学学士（84，湖北师范学院物理系物理专业），工学硕士（88，云南师范大学太阳能研究所热能工程专业），博士（00，澳大利亚University of Sydney机械工程系计算流体力学专业），博士后（0001，美国Texas Tech University化工系）。92年和95年被破格晋升为副教授和教授，0102美国Texas Tech University化工系研究教授，90年获“云南省有突出贡献的优秀专业技术人才”称号，92年起享受“政府特殊津贴”，96年被选拔为首批“云南省中青年学术和技术带头人后备人才培养对象”。曾任中国太阳能学会理事（9500）和Energy编委(9298)。主持承担三项国家自然科学基金资助项目和七项云南省自然科学基金资助项目（含重点，国际合作和学术带头人培养专项），参与承担四项澳大利亚研究理事会和一项美国能源部资助项目。已发表论文80余篇，其中42篇被SCI收录，36篇被EI收录。获云南省科学技术奖二等奖一项，三等奖三项。近年来的主要研究领域为浮力射流和自然对流的直接数值模拟，太阳能热利用技术，太阳能储热材料，太阳辐射分布等。

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林文贤， LIN WENXIAN
，0001，（）：
1年11月30日
With the linear regression technique, it is found that good correlation exists between Hb/Ho and/Kt, this correlation is as follows: Hb/ho=a+bKt Where Hb and Ho are monthly daity average direct and extraterrestrial radiations incident on a horizontal surface, respectively; Kt is the monthly daily average cleamess index; and a and b are empirical coefficients. It is also found that a an db have good correlations wih elevation h, precipitation W, and total cloudiness C, so a general correlation for estimating Hb can be obtained. Yunnan Province, China, has the climatic characteristic of evident dry and wet seasons that correspond to NovemberApril and MayOctober, respectively. Utilizing the meteorological data of these a general correlation for estimating the monthly daily average direct radiation Hb incident on any horizontal surface in Yunnan Province is obtained with the linear regression technique, that is, Hb/Ho=(1.05+77.3/h+8.34/Wd)+(1.7687.62/h11.83/Wd)Kt in dry season Hb/Ho=(0.3454.5/h6.14/Cw)+(3.54+77.0/h+36.7/Cw)Kt in wet season Where his the elevation (m), Wd is the seasonally average monthly total precipitation (mm) in the dry season, and Cw is the seasonally average daily total cloudiness in the wet season. Although this correlation is only applicable for estimation +b in the area of Yunnan Province, it is believed that if the number of stations is large enough a general correlation can be found, which can be applicable for estimating Hb in any area.

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【期刊论文】Longterm behavior of cooling ﬂuid in a vertical cylinder
林文贤， Wenxian Lin a， b， *， S.W. Armﬁeld a
International Journal of Heat and Mass Transfer 48(2005)5366，0001，（）：
1年11月30日
The longterm behavior of cooling an initially quiescent isothermal Newtonian ﬂuid in a vertical cylinder by unsteady natural convection with a ﬁxed wall temperature has been investigated in this study by scaling analysis and direct numerical simulation. Two speciﬁc cases are considered. Case 1 assumes that the ﬂuid cooling is due to the imposed ﬁxed temperature on the vertical sidewall whereas the top and bottom boundaries are adiabatic. Case 2 assumes that the cooling is due to that on both the vertical sidewall and the bottom boundary whereas the top boundary is adiabatic. The longterm behavior of the ﬂuid cooling in the cylinder is well represented by Ta (t), the average ﬂuid temperature in the cylinder at time t, and the average Nusselt number on the cooling boundary. The scaling analysis shows that for both cases ha (s) scales as eC (ARa) 1/4τ1, where θa(τ) is the dimensionless form of Ta(t), s the dimensionless time, A the aspect ratio of the vertical cylinder, Ra the Rayleigh number, and C a proportionality constant. A series of direct numerical simulations with the selected values of A, Ra, and Pr (Pr is the Prandtl number) in the ranges of 1≤3≤6≤A≤6≤3, 6 ×106≤Ra≤6×1010, and 1 ≤Pr≤1000 have been carried out for both cases to validate the developed scaling relations, and it is found that these numerical results agree well with the scaling relations. These numerical results have also been used to quantify the scaling relations and it is found that C = 1.287 and 1.357 respectively for Case 1 and 2 with Ra, A and Pr in the ranges of 1/3≤A≤3, 6×106≤Ra 6×1010, and 1≤Pr≤1000.

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【期刊论文】Longterm behavior of cooling fluid in a rectangular container
林文贤， Wenxian Lin ， ， * and S. W. Armfield
PHYSICAL REVIEW E 69, 056315 (2004)，0001，（）：
1年11月30日
In this study, the longterm behavior of cooling an initially quiescent isothermal Newtonian fluid in a rectangular container with an infinite length by unsteady natural convection due to a fixed wall temperature has been investigated by scaling analysis and direct numerical simulation. Two specific cases are considered. Case 1 assumes that the cooling of the fluid is caused by the imposed fixed temperature on the vertical sidewall while the top and bottom boundaries are adiabatic. Case 2 assumes that the cooling is caused by the imposed fixed temperature on both the vertical sidewall and the bottom boundary while the top boundary is adiabatic. The appropriate parameters to represent the longterm behavior of the fluid cooling in the container are the transient average fluid temperature Tastd over the whole volume of the container per unit length (i.e., the transient area average fluid temperature, as used in the subsequent numerical simulations) at time t and the average Nusselt number on the cooling boundary. A scaling analysis has been carried out which shows that for both cases uas td scales as e−CsARad−1/4τ, where uas td is the dimensionless form of Tastd, τ is the dimensionless time, A is the aspect ratio of the container, Ra is the Rayleigh number, and C is a proportionality constant. A series of direct numerical simulations with the selected values of A, Ra, and Pr (Pr is the Prandtl number) in the ranges of 1/3≤A≤3, 63106≤Ra≤631010, and 1≤Pr≤1000 have been carried out for both cases to validate the developed scaling relations. It is found that these numerical results agree well with the scaling relations. The numerical results have also been used to quantify the scaling relations and it is found that C =0.645 and 0.705 respectively for Cases 1 and 2 with Ra, A and Pr in the abovementioned ranges.

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【期刊论文】The Reynolds and Prandtl number dependence of weak fountains
林文贤， W. Lin， S. W. Armfield
Computational Mechanics 31(2003)379389，0001，（）：
1年11月30日
The effect of the Prandtl number (Pr) and the Reynolds number (Re) on the behaviour of weak laminar axisymmetric and plane fountains has been studied using dimensional and scaling analyses and direct numerical simulation. For Fr ～ 1.0 and assuming viscous effects are important, the analysis shows that for both the axisymmetric and plane fountains, ym ～ FrRe1/2, where Fr is the Froude number defined at the fountain source and ym is the nondimensionalized fountain height. These scalings are also valid for the nondimensionalized fountain width. The analyses also shows sms ～ Fr2, where sms is the nondimensionalized time scale for the fountain flow in the fountain core to reach steady state, and using this time scale ΔyT ～ Fr (RePr)1/2, where ΔyT is the nondimensionalized thickness of the temperature layer on the symmetry axis over which the fountain fluid temperature changes from the inlet value to that of the ambient fluid. All these scalings have been quantified by the direct numerical simulations, hence confirming in certain ranges the phenomenological scaling obtained in this paper. Keywords Weak fountain flow, Prandtl number, Reynolds number, Direct numerical simulation, Scaling analysis
Weak fountain flow， Prandtl number， Reynolds number， Direct numerical simulation， Scaling analysis

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【期刊论文】Weak fountains in a stratified fluid
林文贤， Wenxian Lin* and S. W. Armfield†
PHYSICAL REVIEW E 66, 066308 (2002)，0001，（）：
1年11月30日
The behavior of weak axisymmetric and plane fountains resulting from the injection of denser fluid upwards into large containers containing a stably stratified fluid has been explored using dimensional analysis, scaling analysis, and direct numerical simulation. For weak fountains, with Froude number Fr ≈ 1.0, dimensional and scaling analyses have been used to derive scaling relations for the dimensionless fountain height, width, thickness of the temperature layer, and development times in terms of the Froude number Fr, Reynolds number Re, Prandtl number Pr, and ambient stratification number s. Numerical simulations have been carried out for a series of Fr, Re, Pr, and s for both axisymmetric and plane fountains to validate and quantify the scaling relations obtained by the dimensional and scaling analyses. The numerical results have been found to agree well with the analytical scaling relations.

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林文贤， Wenxian Lin， S.W. Armfield *， P.L. Morgan
International Journal of Heat and Mass Transfer 45(2002)451459，0001，（）：
1年11月30日
In this study, the unsteady natural convection boundarylayer flow along an impulsively heated vertical isothermal plate immersed in a stably stratified semiinfinite ambient fluid is explored using scaling analysis and direct numerical simulation. Scaling relations are obtained for the thermal and velocity boundary layer thicknesses, the boundary layer velocity, the development time and the Nusselt number, in terms of the Rayleigh and Prandtl numbers and the stratification parameter. The scaling results are validated using the numerical simulations.

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【期刊论文】Natural convection cooling of rectangular and cylindrical containers
林文贤， Wenxian Lin *， S.W. Arm
International Journal of Heat and Fluid Flow 22(2001)7281，0001，（）：
1年11月30日
Scalings are obtained for the development of unsteady natural convection, both in rectangular and vertical circular containers, and are validated by comparison with results obtained using direct numerical simulation. It is found that the numerical results agree well with the scalings. Three main stages of flow evolution are identi
Scaling， Direct simulation， Unsteady natural convection

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【期刊论文】VERY WEAK FOUNTAINS IN A HOMOGENEOUS FLUID
林文贤， Wenxian Lin and S. W. Armfield
Numerical Heat Transfer, Part A, 38: 377396, 2000，0001，（）：
1年11月30日
The behaviour of very weak axisymmetric and plane fountains formed by the discharge of denser fluids upwards into large containers containing a homogeneous fluid of lower density has been studied by dimensional analy sis and direct simulations. For very weak fountains, the momentum fluxes are negligible compared with the buoyancy fluxes and the flows are governed by the balance between the buoyancy and the viscosity. Dimensional analysis shows that the fountain height, fountain width, thickness of the temperature layer on the symmetry axis, and the times for the fountain flow in the fountain core to reach steady state and for the temperat ure layer to be fully developed are scaled by the Froude, Reynolds, and Prandtl numbers. These scalings have been validat ed and quantified by direct numerical simulations.

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【期刊论文】Direct simulation of weak axisymmetric fountains in a homogeneous fluid
林文贤， By WENXIAN LIN AND S. W. ARMFIELD
J. Fluid Mech. (2000), 403, 6788，0001，（）：
1年11月30日
The weak axisymmetric fountain that results from the injection of a dense fluid upwards into a large container of homogeneous fluid of lower density is studied numerically. Using a timeaccurate nite volume code, the behaviour of fountains with both a uniform and a parabolic prole of the discharge velocity at the source has been investigated. The evolution of the transient fountain flow has been analysed and two distinct stages have been identi ed. The time series of the passage of the fountain front has been presented and the initial, temporary and nal characteristic fountain heights have been determined and scaled with the Froude number at the source. At steady state, the nal fountain height and the fountain width are found to be the height and horizontal length scales which provide the full parameterization of the flow in the fountain core. The vertical velocity and temperature on the symmetry axis have been scaled with the height scale and an explicit correlation is also obtained for the former. The radial distributions of both the vertical and horizontal velocities in the zone of selfsimilarity in the fountain core at steady state have been scaled with the two length scales and empirical correlations have been obtained.

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【期刊论文】Direct simulation of weak laminar plane fountains in a homogeneous fiuid
林文贤， Wenxian Lin*， S.W. Armfield
International Journal of Heat and Mass Transfer 43(2000)30133026，0001，（）：
1年11月30日
The behaviour of weak laminar plane fountains that result from the injection of dense fiuids upwards into a large container of homogeneous fiuid of lower density is studied numerically by using a timeaccurate finite volume code. The study is an extension of a previous numerical study on weak laminar axisymmetric fountains. Weak laminar plane fountains with both a uniform and a parabolic profile of the discharge velocity at the source have been investigated. The initial, temporary and final characteristic fountain heights and the times for the fountain front to reach these heights have been determined and scaled. At steady state, a height scale as well as a horizontal length scale for the fountain width are determined. The vertical distribution of the vertical velocity and temperature on the symmetry line are shown to scale with this height. The height and horizontal length scales have been used to scale the horizontal variation of both the horizontal and the vertical velocity in the fountain core at steady state.

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