convection effects and heat transfer for viscous flows
Manipulation of turbulent flow for drag reduction and heat transfer enhancement 1
... of h/D on Nusselt number, friction coefficient and performance factors: h/D stands for height ratio for protrusion, while it stands for depth ratio for dimple 191 5.4 Normalized friction ... 1998; Quadrio and Ricco, 2004; Ricco and Wu, 2004; Xu and Huang, 2005; Ricco and Quadrio, 2008; Yudhistira and Skote, 2011) have been done on this topic to examine the performance and possible ... in corrugated channel, solid lines stand for ξ and dashed lines stand for η 125 3.28 The drag difference ΔD at different Reτ and S when α → 130 3.29 Effects of phase...
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Manipulation of turbulent flow for drag reduction and heat transfer enhancement 2
... the flow rate, and L is the length of channel No slip boundary condition (2.13) for velocity and constant heat flux boundary condition (2.14) for temperature are imposed at the upper and lower walls: ... need to be validated and tested for grid independence before employing to calculate for the flow over the corrugated and dimples/protrusion surface 2.4.1.1 DNS Six test runs for the smooth flat parallel ... between our DES and DNS results This implies that our DES method can correctly capture key features of turbulence, and is suitable for investigation of drag reduction and heat transfer enhancement...
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Manipulation of turbulent flow for drag reduction and heat transfer enhancement 3
... -0.5 Y (a) Y (b) 2 v’ for corrugated plate w’2 for corrugated plate v’ for flat plate w’ for flat plate v’ for corrugated plate w’ for corrugated plate v’2 for Flat plate w’ for Flat plate v’ , ... fast and slow fluid in the wide and narrow portions (viscous term in Eqs 3.17 and 3.18) becomes stronger due to the smaller physical distance between the wide and narrow portions Thus, the viscous ... turbulent channel flow: ΔD = Cf − Cf Cf where Cf stands for corrugated channel and Cf stands for flat channel Note that positive ΔD means drag increase, and conversely negative ΔD means drag reduction...
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Manipulation of turbulent flow for drag reduction and heat transfer enhancement 4
... (2.25) and (2.26) All these factor ratios are calculated in order to quantitatively assess the performances such as the pressure loss Cf /Cf and heat transfer capacity N u/N u0 for different heat transfer ... (h/D=10%) Figure 4.8 shows the pressure loss and heat transfer capacity for Case (h/D = 10%, Table 4.1) For Case 2C (Dz = 0%), the heat transfer ratio 151 Performance ratio Cf/Cf0 of symmetric dimple ... heat transfer 4.4.2 Mean characteristics of drag and heat transfer Since Case has higher heat transfer characteristics than Case 2, we shall examine in greater details the various sub-cases for...
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Manipulation of turbulent flow for drag reduction and heat transfer enhancement 5
... performance factors for protrusions (d) performance factors for dimples Figure 5.3: Effect of h/D on Nusselt number, friction coefficient and performance factors: h/D stands for height ratio for ... discussed 5.2.1 Hydrodynamic and thermal performance The normalized average friction ratio Cf /Cf , Nusselt number ratio N u/N u0 and performance factors (Ga/Ga0 and Gv/Gv0 ) for protrusions with various ... verify this finding and to ascertain what affects the location of the highest hydrodynamic and thermal factors, more computational runs were carried out for the flow and heat transfer over protrusion...
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Effect of periodic suction on three dimensional flow and heat transfer past a vertical porous plate embedded in a porous medium
... -6.4648 4.4 Rate of heat transfer The rate of heat transfer at the wall i.e the heat flux in terms of Nusselt number Nu for different values of α and Kp are entered in Table The heat flux at the ... Panda J P Mass transfer effects on MHD flow and heat transfer past a vertical porous plate through a porous medium under oscillatory suction and heat source Int J Heat Mass Transfer 2009, 52, 5962-5969 ... technique and the effects of the pertinent parameters on the velocity, temperature, skin friction and the rate of heat transfer are discussed with the help of figures and tables Mathematical formulation...
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Đề tài " Stability of mixing and rapid mixing for hyperbolic flows " pot
... set for a flow Φt ∈ Ar (M ) and suppose that Λ is not rapid mixing Then there exists c > and C > such that for every α > 0, there exists β > and a sequence |bk | → ∞ such that for each k ≥ and ... could be arbitrarily slow On the other hand, exponential mixing is proved for the aforementioned restricted classes of Anosov flows and also for certain uniformly hyperbolic attractors with one-dimensional ... Stability of mixing and rapid mixing for hyperbolic flows ¨ ¨ By Michael Field, Ian Melbourne, and Andrei Torok* Abstract We obtain general results on the stability of mixing and rapid mixing (superpolynomial...
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engineering thermofluids thermodynamics fluid mechanics and heat transfer
... Incompressible Viscous Flow IIIb Heat Transfer (IV) Compressible Viscous Flow IIIc Conduction Convection IVa Radiation IVb & IVc Two-Phase Flow & Heat Transfer (V) Two-phase Heat Transfer Two-Phase ... Pressure Pa Perimeter m Heat transfer per unit mass J/kg Linear heat generation rate W/m Heat flux W/m Volumetric heat generation rate W/m Heat transfer J Rate of heat transfer W Gas constant ... Mechanics, and Heat Transfer Mahmoud Massoud Engineering Thermofluids Thermodynamics, Fluid Mechanics, and Heat Transfer With 345 Figures and 13 Tables Dr Mahmoud Massoud University of Maryland Department...
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hydrodynamics, mass, and heat transfer in chemical engineering, crc (2002) - opet
... Mass and Heat Transfer in Liquid Films Tubes and Boundary Layers 3.1 Convective Mass and Heat Transfer Equations and Boundary Conditions 3.1-1 Mass Transfer Equation Laminar Flows ... Fluxes and the Sherwood Number 3.1.6 Heat Transfer The Equation and Boundary Conditions 3.1-7 Some Methods of Theory of Mass and Heat Transfer 3.1-8 Mass and Heat ... MASS AND HEAT TRANSFER IN CHEMICAL ENGINEERING Topics in Chemical Engineering A series edited by R Hughes, University of Salford, UK Volume HEAT AND MASS TRANSFER W PACKED BEDS by N Wakao and...
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mass and heat transfer analysis of mass contactors and heat exchangers (cambridge series in chemical engineering)
... mass and heat transfer Suitable references are provided in each chapter for further study and for aid in the analysis of phenomena not treated herein in depth As a first course in mass and heat transfer, ... A and B): r = kCA CB Rate of heat transfer: Q = Ua (T1 − T2 ) Rate of mass transfer: arA = Km a CI − MCII A A The constitutive equations in Table 1.4 for the flux of heat transfer and mass transfer ... transfer and then to effectively translate this knowledge to the operation and design of mass and heat transfer equipment Develop the students’ molecular understanding of the mechanisms of mass and heat...
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introduction to thermal systems engineering thermodynamics, fluid mechanics, and heat transfer
... Chapter Summary and Study Guide 337 Problems 338 HEAT TRANSFER Heat 15 Getting Started inRate Equations Transfer: Modes, and Energy Balances 342 15.10 Heat Transfer Modes: Physical Origins and Rate ... Fundamentals of Heat and Mass Transfer (4ed, 2002) and Introduction to Heat Transfer (5ed, Wiley, 2002), and includes a number of features that will enhance your study of heat transfer However, ... systems in various forms Energy also can be converted from one form to another and transferred between systems For closed systems, energy can be transferred by work and heat transfer The total...
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Evaporation Condensation and Heat transfer Part 1 docx
... includes 25 advanced and revised contributions, and it covers mainly (1) evaporation and boiling, (2) condensation and cooling, (3) heat transfer and exchanger, and (4) fluid and flow The first ... Bangkok, Thailand, June 8-10, pp 367-372 22 Evaporation, Condensation and Heat Transfer Islam, K.M.S (2006) Heat and vapor transfer in tubular solar still and its production performance, PhD ... (we, wc and wp) and the humid air temperature and relative humidity fraction, Tha/RHha, for the first model and second one (Ahsan et al., 2010) 10 Evaporation, Condensation and Heat Transfer...
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Evaporation Condensation and Heat transfer Part 2 docx
... B and C-stage cooling which are currently designated as film boiling, nucleate boiling and convective cooling, based on the cooling time-temperature and 50 Evaporation, Condensation and Heat Transfer ... nucleate boiling [NB], and convective heat transfer [CONV] with significantly varying heat transfer coefficients αFB (100 to 250 kW m-2 K-1); αNB (10 to 20 kW m-2 K-1), and αCONV (ca 700 W m-2 ... at the probe surface The images clearly show that the two heat transfer modes that combine boiling and forced convection (film boiling and nucleate boiling) may be subdivided The nucleate boiling...
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Evaporation Condensation and Heat transfer Part 3 docx
... of the heater The boundary conditions: ∂Тh/∂x=0 for x=0 and x=Lh for a heater of finite length Lh correspond to the heater’s heat- insulated ends For an infinite heater, we have ∂Th⁄∂x = for x ... boiling and their expansion along the heat- transfer surface drastically affects the heat removal, leading to crash - overheating of the heater surface and to its destruction Dry spots formed in ... need for reliable prediction of the critical heat flux, whose excess leads to the complete draining of heat- releasing surface and uncontrolled heating Study of heat transfer during boiling and...
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Evaporation Condensation and Heat transfer Part 4 pot
... Transient Convective Heat and Mass Transfer in Single and Two Phase Flows Int J Multiphase Flow J Eng Phys High Temperature Techn Phys Lett Thermophysics and Aeromechanics Int J Heat Mass Transfer Actual ... measured the bottom and bulk temperature, which allowed to determine the conditions of heat transfer 126 Evaporation, Condensation and Heat Transfer a) c) b) d) Fig Heat transfer apparatus: ... increase and fixed in time the heat flux density It was found that type of formed structure first of all depends on the heat flux density and duration of the process and the volume oil fraction and...
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Evaporation Condensation and Heat transfer Part 5 potx
... condenser tube is a much better heat transfer surface At any tube 154 Evaporation, Condensation and Heat Transfer cross section with condensation, the local heat flux and heat transfer coefficient at ... However, separate models for the condensate film and vapor/noncondensable gas mixture are linked and solved simultaneously for the heat and mass transfer rates The heat transfer through the vapor/noncondensable ... the heat transfer coefficient for stratified, wavy and slug flows for methanol and acetone at atmospheric pressure By rotating the condenser tube, they measured the variation of the heat transfer...
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Evaporation Condensation and Heat transfer Part 6 pot
... Condensation and Heat Transfer Δ Modelling the Thermo-Hydraulic Performance of Cooling Networks and Its Implications on Design, Operation and Retrofit Δ 201 202 Evaporation, Condensation and Heat Transfer ... Calculate K for valves and pipes Assume number of tubes (Nta) and calculate K for heat exchangers Calculate ΣKpipe, valve, Cx for each single branch Calculate K for network arrangement and Koverall-system ... Performance of Cooling Networks and Its Implications on Design, Operation and Retrofit 197 198 Evaporation, Condensation and Heat Transfer From heat balance determine V; estimate a value for...
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Evaporation Condensation and Heat transfer Part 7 docx
... two heat transfer modes: convection and radiation The division of superheaters into two types: convection and radiant superheaters is based on the mode of heat transfer that is predominant In convection ... smoothtube heat transfer and pressure drop, International Communications in Heat and Mass Transfer, Vol 24, No 6, pp 889 – 896 Oliver, D.R (1962) The effect of natural convection on viscous- flow heat transfer ... tubes for fully developed and developing flow with different types of inlet disturbances: Part II – 260 Evaporation, Condensation and Heat Transfer heat transfer, International Journal for Heat and...
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