The Conduction Form Factor only depends on the geometric configuration of the system (large flat walls, long cylinders or spheres).
Example: The stationary heat transfer ratio between these two surfaces is expressed as where S is the CONDUCTION SHAPE FACTOR, which has the dimension of length, and k is the thermal conductivity of the medium between the surfaces.
es: Factor de forma de conducción
Convection resistance
noun
It is the thermal resistance of the surface against heat convection or simply the resistance to convection of the surface.Note that when the coefficient of heat transfer by convection is very large (h → ∞), the resistance to convection is makes zero and Ts≈T∞. In other words, the surface does not offer resistance to convection and therefore does not slow down the heat transfer process.
Example: It is the thermal resistance of the surface against the convection of heat or simply the CONVECTION RESISTANCE of the surface.
es: Resistencia a la convección
Critical radius of insulation
noun
The critical radius of insulation is a counterintuitive concept within the study of heat transfer. The theory states that adding insulation to a cylindrical or spherical object will increase the rate of heat loss rather than decrease it, if the radius (thickness) of the insulation is at its "critical" value.
Example: Adding insulation to a cylindrical tube of spherical shell increases the rate of heat transfer if the CRITICAL RADIOS INSULATION is less than the critical radius of the insulation.
es: Radio crítico de aislamiento
Cylinder conduction resistance
noun
It is defined as a natural logarithm by dividing the outer radius and the lower radius, all divided by 2 pi, by the length by the thermal conductivity.
Example: is the thermal resistance of the cylindrical layer against heat conduction or simply the CYLINDER CONDUCTION RESISTANCE layer.
es: Resistencia de conducción del cilindro
Efficiency
NOUN
work obtained from the heat / heat received from the reservoir at higher temperature. So we can say that a heat engine is more efficient the more heat it can convert into work,
Example: Firstly, we will consider the "EFFICIENCY" theme and the question of physical renewal and private investment.
es: Eficiencia
Fin effectiveness
noun
It is the improvement of heat transfer, compared to the case in which the fins are not used.
Example: The performance of the fins, expressed in terms of the FIN EFFETIVENESS, is defined as the heat transfer ratio from the fin to the base area Ab, divided by the heat transfer ratio from the surface to the area Ab.
es: Eficacia de la aleta
Fin efficiency
noun
Fin efficiency is defined as the ratio of actual heat flow of the fin to that which would be obtained with a fin of constant temperature uniformly equal to the base surface temperature, that is, one with infinite thermal conductivity.
Example: The temperature of a fin falls along the fin and, therefore,Therefore, the heat transfer from it is less due to the decreasing temperature difference towards the tip. For consider the effect of this decrease in temperature on heat transfer, the efficiency of the fin is defined.
es: Eficiencia de las aletas
Interface resistance
noun
Decreased heat flow caused by imperfect contact between two materials at an interface.
Example: The first important model for heat transfer at the interfaces was the acoustic mismatch model which predicted a T −3 temperature dependence of the INTERFACE RESISTANCE, but this failed to adequately model the thermal conductance of the helium interfaces by up to two orders of magnitude.
es: Resistencia de la interfase
Plane wall conduction resistance
nouns
Again, the rate of heat conduction through a flat wall is proportional to the average thermal conductivity, the area of the wall, and the temperature difference, but it is inversely proportional to the thickness of the wall.
Example: Equation 3-3 for heat conduction through a flat wall can be rearranged to have is the thermal resistance of the wall against heat conduction or simply the PLANE WALL CONDUCTION RESISTANCE.
es: Resistencia a la conducción de la pared plana
Radiation resistance
noun
The radiation resistance can be defined as the value of resistance that would dissipate the same amount of power as radiated as radio waves by the antenna with the antenna input current passing through it.
Example: The small loops of a single turn have small RADIATION RESISTANCE (< 1 Ω) usually comparable to their loss resistance. Their radiation resistance, however, can be improved by adding more turns. Also, the small loops are narrowband. Typical bandwidths are less than 1%.
es: Resistencia a la radiación
Sphere conduction resistance
noun
It is the thermal resistance of the spherical layer against the conduction of heat or, simply, the resistance to the conduction of the spherical layer
Example: is the thermal resistance of the spherical layer against heat conduction or simply the SPHERE CONDUCTION RESISTANCE layer
es: Resistencia a la conducción de la esfera
Surfaces
noun
Finned surfaces are commonly used in practice to improve heat transfer. Fins improve heat transfer from a surface by exposing a larger area to convection
Example: Total effectiveness for a finned SURFACE is defined as the ratio of the total heat transfer from the finned surface to the heat transfer from the same surface if it had no fins.
es: Superficie
Thermal contact conductance
noun
thermal contact conductance is the study of heat conduction between solid bodies in thermal contact.This drop in temperature is characterized by the coefficient of thermal contact conductance, h c, which is a property that indicates the thermal conductivity, or the ability to conduct heat, between two bodies in contact.
Example: The quantity hc, which corresponds to the convection heat transfer coefficient, is called the THERMAL CONTACT CONDUCTANCE.
es: Conductancia de contacto térmico
Thermal contact resistance
noun
Thermal contact resistance is defined as the ratio between this temperature drop and the average heat flow across the interface
Example: Therefore, an interface offers some resistance to heat transfer, and this resistance per unit area of the interface is called THERMAL CONTACT RESISTANCE
es: Resistencia al contacto térmico
Total thermal resistance
noun
Thermal resistance is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow. ... It is the thermal resistance of unit area of a material.
Example: As indicated in Equation 2, the value of the THERMAL RESISTANCE can be determined by dividing the thickness with thermal conductivity of the specimen.
