Nusselt number

[′nu̇s·əlt ‚nəm·bər]

(physics)

A dimensionless number used in the study of mass transfer, equal to the mass-transfer coefficient times the thickness of a layer through which mass transfer is taking place divided by the moleculor diffusivity. Symbolized Nu_m; N_{Nu _m}. Also known as Sherwood number (N_Sh).

(thermodynamics)

A dimensionless number used in the study of forced convection which gives a measure of the ratio of the total heat transfer to conductive heat transfer, and is equal to the heat-transfer coefficient times a characteristic length divided by the thermal conductivity. Symbolized N_Nu.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Nusselt Number

a dimensionless parameter that characterizes the intensity of convective heat exchange between the surface of a body and a flow of gas (or liquid). It is named after the German physicist W. Nusselt (1882–1957). The Nusselt number Nu = αl/λ, where α = Q/(S · ΔT) is the heat-exchange coefficient, Q is the heat transfer across the surface of the body per unit time, ΔT > O is the difference of temperature between the surface of the body and the gas (or liquid) measured outside the boundary layer, S is the area of the surface, l is a characteristic dimension, and λ is the coefficient of thermal conductivity of the gas.

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References in periodicals archive

The results of Nusselt number increase with decreasing the nanoparticles diameter.

Performance of the heat transfer behavior of Tri Ethylene Glycol (TEG) based cuo and sin nanofluids in a rectangular pipe under the turbulent flow condition

Figure 19 presents the effect of the rotating parameter A on the local Nusselt number. The local Nusselt number decreases with increase in A with the effect being more momentous towards the steady-state flow.

On a Bivariate Spectral Homotopy Analysis Method for Unsteady Mixed Convection Boundary Layer Flow, Heat, and Mass Transfer due to a Stretching Surface in a Rotating Fluid

The influence of volume concentration ratios as a function of temperature on the Nusselt number is shown in Figure 13(b).

Improving the Hybrid Photovoltaic/Thermal System Performance Using Water-Cooling Technique and Zn-[H.sub.2]O Nanofluid

Nusselt Number. Nondimensional Nusselt number [Nu.sub.S] = -([partial derivative][[theta].sub.S]/[partial derivative]R)[|.sub.R=1] is obtained from temperature profile (18) as

Unsteady Natural Convection Flow past an Infinite Cylinder with Thermal and Mass Stratification

In heat transfer at a boundary (surface) within a fluid, the Nusselt number (Nu) is the ratio of convective to conductive heat transfer across (normal to) the boundary.

Investigation of attic space airflow and temperature distribution using a computational fluid dynamics program

Local Nusselt number Nualong the cylinder surface was obtained using Eq.

LOW REYNOLDS NUMBER CONVECTIVE HEAT TRANSFER ACROSS A CIRCULAR CYLINDER WITH UNIFORM VOLUMETRIC ENERGY DISSIPATION

The Churchill and Bernstein (1977) relation can be used to calculate the Nusselt number across a separate cylinder for a wide range of Reynolds and Peclet numbers ([10.sup.2] < Re < [10.sup.7], Pe > 0.2):

Polymeric Hollow Fiber Heat Exchangers: Liquid-to-Gas Application

Thus, the stream-wise velocity distributions at the module inlets (see Figure 9) and normalized pressure drop Figure 4 and module average Nusselt number for each module (Table 2) confirm the existence of periodically fully developed flow downstream of the second module.

Thermohydraulic performance of a series of in-line noncircular ducts in a parallel plate channel

For the characterization of the heat transfer of the cabin and the TM, a Nusselt number (Nu) is defined.

Novel Ventilation Concepts for Efficient Heating Dynamics of Vehicle Passenger Compartments

The numerical values for the skin friction, the local Nusselt number are presented and examined.

Effects of slip and convective conditions on MHD flow of nanofluid over a porous nonlinear stretching/shrinking sheet