Adrian Alvarez Patiño 7°G

10 Heat Transfer terms

This electronic glossary contains key vocabulary and concepts from reading of the book "Heat Transfer - A Practical Approach" to familiarize yourself with the terminology.

Convection heat transfer coefficient: phrase; Quantifies the influence of fluid, surface, and flow properties when convective heat transfer occurs.; Example: The total heat transfer coefficient is influenced by the thickness and thermal conductivity of the materials through which heat is transferred.; es: Coeficiente de transferencia de calor por convección
Critical Reynold’s number: phrase; The critical Reynolds number is associated with the laminar-turbulent transition, in which a laminar flow becomes turbulent.; Example: Note that the critical Reynolds number is different for each geometry.; es: Número crítico de Reynolds
Friction Coefficient: phrase; It is the ratio between the sliding force and the retention force exerted by two surfaces in contact.; Example: Ice on a polished steel sheet has a low coefficient; while the rubber on the pavement has a high coefficient.; es: Coeficiente de fricción
Kinematic viscosity: phrase; It is a measure of the internal resistance of a fluid to flow under gravitational forces.; Example: The viscosity of some fluids is measured experimentally with viscometers and rheometers. A fluid that has no viscosity is a superfluid.; es: Viscosidad cinemática
Laminar flow: phrase; Laminar flow or laminar current is called the movement of a fluid when it is ordered, stratified or smooth.; Example: Laminar flow is typical of fluids at low velocities or high viscosities.; es: Flujo laminar
Nusselt number: phrase; "The Nusselt number is the relationship between convection and conduction heat transfer through a boundary."; Example: There are many empirical correlations expressed in terms of the Nusselt number, eg flat plates, cylinders, inside pipes, etc., which generally evaluate the mean Nusselt number on a surface.; es: Número de Nusselt
Prandtl number: phrase; It is a dimensionless number proportional to the quotient between the diffusion speed of the amount of moment (viscosity) and the thermal diffusivity.; Example: In heat transfer problems the Prandtl number controls the relative thickness of the moment and thermal boundary layers.; es: Número de prandtl
Reynold number: phrase; It is a dimensionless number used in fluid mechanics, reactor design, and transport phenomena to characterize the motion of a fluid. Its value indicates whether the flow follows a laminar or turbulent pattern.; Example: In biology and in particular in biophysics, the Reynolds number determines the relationships between mass and speed of movement of microorganisms.; es: Número de Reynold
Shear stress: phrase; It is the internal or resultant stress of the stresses parallel to the cross section of a mechanical prism such as a beam or a column.; Example: Direct shear forces are applied daily on fabrics, papers or metals, exerted by scissors, guillotines or shears.; es: Esfuerzo cortante
Turbulent flow: phrase; It is one in which there are fluctuations in the flow all the time and the particles invade the path of the adjacent particles, mixing and moving in a random way; Example: Turbulent flow occurs in a large number of configurations such as channels, pipes, reactors, whether they are biochemical, physical or nuclear.; es: Flujo turbulento