Exemplos de uso de Biot number em Inglês e suas traduções para o Português
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In this case, again, the Biot number will be greater than one.
The Biot number must generally be less than 0.1 for usefully accurate approximation and heat transfer analysis.
The second chart is used to determine the variation of temperature within the plane wall for different Biot Numbers.
Biot numbers much larger than 1 signal more difficult problems due to non-uniformity of temperature fields within the object.
In contrast, the metal sphere may be large,causing the characteristic length to increase to the point that the Biot number is larger than one.
The Biot number has a variety of applications, including transient heat transfer and use in extended surface heat transfer calculations.
If the thermal resistance of the fluid/sphere interface exceeds that thermal resistance offered by the interior of the metal sphere, the Biot number will be less than one.
Having a Biot number smaller than 0.1 labels a substance as"thermally thin," and temperature can be assumed to be constant throughout the material's volume.
Evaluations were performed about the effects of external resistance influenced by the speed of rotation of the catalytic basket by the biot number.
The curves within the graph are a selection of values for the inverse of the Biot Number, where"Bi hL/k. k is the thermal conductivity of the material and h is the heat transfer coefficient.
When the thermal resistance to heat transferred into the object is larger than the resistance to heat being diffused completely within the object, the Biot number is less than 1.
For example, a Biot number less than 0.1 typically indicates less than 5% error will be present when assuming a lumped-capacitance model of transient heat transfer also called lumped system analysis.
The primary diffusion coefficients, the crossed diffusion coefficients,the mass transfer coefficient and the biot number were determined using the simplex optimisatio.
Applications==Values of the Biot number smaller than 0.1 imply that the heat conduction inside the body is much faster than the heat convection away from its surface, and temperature gradients are negligible inside of it.
The storage material is divided into several smaller sections in order to satisfy the validity condition of the global capacitance model,resulting in biot numbers smaller or equalthan 0.1 for each section.
The opposite is also true: A Biot number greater than 0.1(a"thermally thick" substance) indicates that one cannot make this assumption, and more complicated heat transfer equations for"transient heat conduction" will be required to describe the time-varying and non-spatially-uniform temperature field within the material body.
When stated in terms of temperature differences,Newton's law(with several further simplifying assumptions, such as a low Biot number and temperature-independent heat capacity) results in a simple differential equation for temperature-difference as a function of time.
In this case, particularly for Biot numbers which are even smaller, the approximation of spatially uniform temperature within the object can begin to be used, since it can be presumed that heat transferred into the object has time to uniformly distribute itself, due to the lower resistance to doing so, as compared with the resistance to heat entering the object.
To validate the theoretical methodology microwave drying experiments were carried out with rice grains in fresh bark(variety brsmg conai) in three levels of absorbed power: 0.192; 0.491 and0.694 w. results of the effect of the solid aspect ratio, biot numbers of mass and heat transfer, power density and attenuation factor of the electromagnetic wave on the drying and heating kinetics.
The Biot number can be used in transient conduction problems in a lumped parameter solution, which can be written as, :formula_3==Mass transfer analogue==An analogous version of the Biot number(usually called the"mass transfer Biot number", or formula_4) is also used in mass diffusion processes: :formula_5where:*hm- film mass transfer coefficient*LC- characteristic length*DAB- mass diffusivity.
In the period between 1935 and 1962 Biot published a number of scientific papers that lay the foundations of the theory of poroelasticity(now known as Biot theory), which describes the mechanical behaviour of fluid-saturated porous media.