Download e-book for iPad: Advances in Industrial Heat Transfer by Alina Adriana Minea

By Alina Adriana Minea

ISBN-10: 143989907X

ISBN-13: 9781439899076

Advances in business warmth Transfer offers the fundamental rules of business warmth move enhancement. Serving as a reference and advisor for destiny learn, this ebook offers an entire method, from remodeling apparatus to using nanofluids in industry.

Based at the most modern equipment of the test and their interpretation, this booklet offers a unified perception of the economic warmth move strategy and tactics in an effort to aid lessen worldwide power intake. Containing either theoretical and useful effects, the ebook makes use of textual content, photos, graphs, and definitions to demonstrate issues and spotlight concepts.

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43) is the effective radiation intensity of body 1, I1 is the own radiation intensity of body 1 and (1 – S1) I2ef is the reflective part of the total intensity of body 2. , Engineering Heat and Mass Transfer, Praise Worthy Prize, Naples, Italy, 2009. With permission. Copyright 2009. 3 Heat Transfer Enhancement Heat transfer plays an important role in numerous applications. For example, in vehicles, heat generated by the prime mover needs to be removed for proper operation. Similarly, electronic equipments dissipate heat, which requires a cooling system.

The discrepancy leads to different analyses and different results. • Different nanofluid preparation techniques. Depending on how the nanofluids are made, for instance, whether it is by a one-step or two-step method, the dispersion of the nanofluids could be affected. Some researchers coat the nanoparticles to inhibit agglomeration, while others do not. Nomenclature c cp cv D e Fr g Ga Gr h I k L L n n N NA Nu p Pe Pr q qv characteristic water wave propagation velocity (m/s) specific heat (J/kg K) molar heat capacity (J/kg K) diameter (m) emissive power (J/sm2) Froude number acceleration due to earth’s gravity (m/s2) Galilei number Grashof number convective heat transfer coefficient (W/m2 K) radiation intensity (W/m2) thermal conductivity (W/m K) characteristic linear dimension (m) Lorenz number (WΩ/K2) number of moles particles per unit volume (1/m3) number of molecules Avogadro’s number Nusselt number pressure (Pa) Péclet number Prandtl number unitary heat flux (W/m2) volume density of internal heat sources (W/m3) 41 42 Q R Ra Re Rt S St t T T∞ Ts V w x,y,z r,ϕ,z Advances in Industrial Heat Transfer heat quantity (W) universal gas constant (J/mol K) Rayleigh number Reynolds number thermal resistance (s m2/W) surface (m2) Stanton number temperature (°C) temperature (K) bulk temperature (K) surface temperature (K) volume (m3) mean velocity of the object associated to the fluid (m/s) rectangular system coordinates (m) cylindrical system coordinates Greek Letters α thermal diffusivity (m2/s) β volumetric thermal expansion coefficient ελ emittance λ mean free path (μm) ν kinematic viscosity (m2/s) ρ density (kg/m3) σ electrical conductivity (S/m) σ Stefan–Boltzmann constant (J/sm2 K4) τ time, (s) References Bejan, A.

Commonly used heat transfer fluids such as water, ethylene glycol and engine oil have relatively low thermal conductivities when compared to the thermal conductivity of solids. High thermal conductivity of solids can be used to increase the thermal conductivity of a fluid by adding small solid particles to that fluid. The feasibility of the usage of such suspensions of solid particles with sizes on the order of 2 mm or μm was previously investigated by several researchers, and significant drawbacks were observed.

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Advances in Industrial Heat Transfer by Alina Adriana Minea

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