Heat transport coefficients for constant energy flux models of broad leaves

Wigley, Graham; Clark, J. A.

doi:10.1007/bf00227909

Cited by 51 publications

(55 citation statements)

References 10 publications

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“…4). This type of observation has also been made with respect to heat flux data from the leaves of a terrestrial plant, Phaseolus vulgaris (Wigley and Clark 1974) (Fig. 4).…”

Section: Discussionmentioning

confidence: 89%

Diffusive boundary layers do not limit the photosynthesis of the aquatic macrophyte, Vallisneria americana, at moderate flows and saturating light levels

Nishihara¹,

Ackerman²

2009

Limnology & Oceanography

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Hydrodynamic models of mass transport assume that diffusive processes next to the surface limit transport and that there are no biological and chemical processes that control the supply and demand of the scalar. The validity of these assumptions was examined by measuring the momentum boundary layer (via particle image velocimetry) and the concentration boundary layer (via O 2 microsensors) over the leaves of Vallisneria americana. The O 2 flux (J obs ) was highest at x 5 2 cm downstream from the leading edge of the leaf and was 1.8 to 1.4 times higher than J obs measured at the trailing edge of the leaf at 0.5 cm s 21 and 6.6 cm s 21 mean velocity (U), respectively. The maximum J obs was 0.44 6 0.07 (mean 6 SE) vs. 0.50 6 0.09 mmol m 22 s 21 at 0.5 vs. ). An analysis of the time scale of nutrient diffusion (t D ) vs. nutrient uptake (t up ) through the measured diffusion boundary layer revealed that uptake was always the slower process (i.e., t D , t up ; t D and t up increased with x and decreased with U). Under moderate water velocities and saturating irradiance, uptake rates rather than diffusive transport processes appear to control mass transfer rates regardless of the location on the leaf and the water velocity.

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“…4). This type of observation has also been made with respect to heat flux data from the leaves of a terrestrial plant, Phaseolus vulgaris (Wigley and Clark 1974) (Fig. 4).…”

Section: Discussionmentioning

confidence: 89%

Diffusive boundary layers do not limit the photosynthesis of the aquatic macrophyte, Vallisneria americana, at moderate flows and saturating light levels

Nishihara¹,

Ackerman²

2009

Limnology & Oceanography

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“…Perrier et al (1973) suggested, therefore, that a friction velocity (or some other measure of surface roughness) should be used as a scaling factor in studies on artificial leaves. Wigley & Clark (1974) emphasized the increased heterogeneity in surface temperature distribution for a real vs. an idealized leaf (see Fig. 1 b).…”

Section: Velocity and Humidity Profiles In The Blmentioning

confidence: 89%

“…For large leaves like Tectona grandis L.f. or Gmenlina arborea L., which are characterized by high stomatal conductance and high BL resistance, it may become the dominant factor in diffusion pathways (Grace, Fasehun & Dixon, 1980). Like all diffusion processes, the transfer of heat or Grace & Wilson, 1976); (6) Temperature differences observed between surface of artificial and natural leaf, and ambient air (from Wigley & Clark, 1974).…”

mentioning

confidence: 99%

Tansley Review No. 59 Leaf boundary layers

1993

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Studies of heat and mass exchange between leaves and their local environment are central to our understanding of plant‐atmosphere interactions. The transfer across aerodynamic leaf boundary layers is generally described by non‐dimensional expressions which reflect largely empirical adaptations of engineering models derived for flat plates. This paper reviews studies on leaves, and leaf models with varying degrees of abstraction, in free and forced convection. It discusses implecations of finding for leaf morphology as it affects – and is affected by – the local microclimate. Predictions of transfer from many leaves in plant communities are complicated by physical and physiological feedback mechanisms between leaves and their environment. Some common approaches, and the current challenge of integrating leaf‐atmosphere interactions into models of global relevance, are also briefly addressed.

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“…Integrating for average temperature or heat flux over a rectangle gives a similar relation: Nu = Y Re" Pr"3, 7), Line 2 is from Landsberg and Powell (1973) for the geometry of this tree, and Line 3 is for their isolated leaf; Line 4 is from Monteith (1965); Line 5 is from Scheupp (1972) for clustered leaves; and Line 6 is from Wigley and Clark (1974).…”

Section: Discussionmentioning

confidence: 99%

Heat transfer coefficients for leaves on orchard apple trees

Thorpe

Butler

1977

Boundary-Layer Meteorol

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The coefficient for heat transfer from apple tree leaves was measured from the energy balance of leaves which were prevented from transpiring by applying 'Vaseline' (petroleum jelly). Vaseline had negligible effect on the absorption of short-wave radiation by the leaves. The Nusselt number (Nu) describing heat flux from a leaf in terms of its average temperature was related to Reynolds numbers (Re) in the range lo3 to lo4 bywhere Pr is the Prandtl number. This supports Landsberg and Powell's (1973) wind-tunnel results for transfer from leaves subject to mutual interference.

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Heat transport coefficients for constant energy flux models of broad leaves

Cited by 51 publications

References 10 publications

Diffusive boundary layers do not limit the photosynthesis of the aquatic macrophyte, Vallisneria americana, at moderate flows and saturating light levels

Diffusive boundary layers do not limit the photosynthesis of the aquatic macrophyte, Vallisneria americana, at moderate flows and saturating light levels

Tansley Review No. 59 Leaf boundary layers

Heat transfer coefficients for leaves on orchard apple trees

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