Tính toán HT trao đổi nhiệt heat transfer calculations

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Tính toán HT trao đổi nhiệt heat transfer calculations

MCGRAW-HILL ' j / //___ CaỉcuSabỉoiMOf • >Heat-TransferCalculationsMYER KUTZ■ Heat-exchanger calculations■ Thermal properties of solid materials■ Cond

Tính toán HT trao đổi nhiệt heat transfer calculations duction heat transfer______________________________________________ranIntroductory CalculationsHeat-Transfer Calculations opens with- eight brief indu

strial heat-transfer calculations. While they are short, especially when compared to the calculations that make up the hulk of this handbook, these op Tính toán HT trao đổi nhiệt heat transfer calculations

ening calculations are not trivial. And they deal with, real life, which is the hallmark of the calculations throughout the book:■A chemical processin

Tính toán HT trao đổi nhiệt heat transfer calculations

g technology that needs a thinner liquid film coaling for belter adhesive properties of a new product■A new passive method of cooling an electronic as

MCGRAW-HILL ' j / //___ CaỉcuSabỉoiMOf • >Heat-TransferCalculationsMYER KUTZ■ Heat-exchanger calculations■ Thermal properties of solid materials■ Cond

Tính toán HT trao đổi nhiệt heat transfer calculations s the amount of metal poured to produce a good casting■A furnace wall In a coal-fired power plant■A rein forced-concrete smokestack that must be lined

with a refractory Oil the Inside■The condenser In a large steam power plant■The duct of an air condition ing plant■A concentric tube heat exchanger w Tính toán HT trao đổi nhiệt heat transfer calculations

ith specified operating conditions______________________________________________________fittps://khothuvien.comKxl I Cl pic; IMultiphase Films and Pha

Tính toán HT trao đổi nhiệt heat transfer calculations

se ChangeGreg F. NatererUniversity of Ontario Institute of Technology Oshawa, Ontario. CanadaProblem 1A chemical processing technology needs a thinner

MCGRAW-HILL ' j / //___ CaỉcuSabỉoiMOf • >Heat-TransferCalculationsMYER KUTZ■ Heat-exchanger calculations■ Thermal properties of solid materials■ Cond

Tính toán HT trao đổi nhiệt heat transfer calculations trol is needed to achieve a specified level of adhesive quality. This goal is accomplished by changing the wall temperature at a certain point along t

he plate, which affects the thermal boundary layer within the film. Before evaluating heat transfer based on the Nusselt number, the film velocity is Tính toán HT trao đổi nhiệt heat transfer calculations

needed to predict thermal convection within the film. Then the growth of the thermal boundary layer can be determined. The spatial profile of temperat

Tính toán HT trao đổi nhiệt heat transfer calculations

ure remains constant, after the point where the edge of the thermal boundary layer reaches the edge of the film. This point is needed for sizing of th

MCGRAW-HILL ' j / //___ CaỉcuSabỉoiMOf • >Heat-TransferCalculationsMYER KUTZ■ Heat-exchanger calculations■ Thermal properties of solid materials■ Cond

Tính toán HT trao đổi nhiệt heat transfer calculations perature within the film. This processing temperature affects the adhesive properties of the film.Consider a liquid film (ethylene glycol at 300 K) du

ring testing of the chemical process. The film slows steadily down along a flat plate in the X direction. The plate is inclined at an angle of 0 with Tính toán HT trao đổi nhiệt heat transfer calculations

respect to the horizontal direction. The X position is measured along the direction of the plate. It is assumed that the film thickness (S remains nea

Tính toán HT trao đổi nhiệt heat transfer calculations

rly uniform. A reference position of X 0 is defined at a point where the wall boundary conditions change abruptly. Before this point, the film, wall,

MCGRAW-HILL ' j / //___ CaỉcuSabỉoiMOf • >Heat-TransferCalculationsMYER KUTZ■ Heat-exchanger calculations■ Thermal properties of solid materials■ Cond

Tính toán HT trao đổi nhiệt heat transfer calculations r ÔT develops and grows in thickness within the film.Part (a) Using a reduced form of the momentum equation in the liquid film, as well as appropriate

interfacial and wall boundary conditions, derive the following velocity distribution in the film:u vjwhere Ư refers to the velocity at the film-air i Tính toán HT trao đổi nhiệt heat transfer calculations

nterface. Neglect changes of film velocity in the X direction along the plate.Part (b) Consider a linear approximation of the temperature profile with

Tính toán HT trao đổi nhiệt heat transfer calculations

in the thermal boundary layer, specifically, T a + by, where the coefficients a and b can be determined from the boundary conditions. Then perform an

MCGRAW-HILL ' j / //___ CaỉcuSabỉoiMOf • >Heat-TransferCalculationsMYER KUTZ■ Heat-exchanger calculations■ Thermal properties of solid materials■ Cond

Tính toán HT trao đổi nhiệt heat transfer calculations cm/s and a film thickness of 2 mm, estimate the X location where òr reaches the edge of the liquid film.

MCGRAW-HILL ' j / //___ CaỉcuSabỉoiMOf • >Heat-TransferCalculationsMYER KUTZ■ Heat-exchanger calculations■ Thermal properties of solid materials■ Cond