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Tuesday, November 17, 2020 | History

2 edition of Variations of local heat transfer coefficient in piped flow of viscous liquids. found in the catalog.

Variations of local heat transfer coefficient in piped flow of viscous liquids.

Michael McIntyre

Variations of local heat transfer coefficient in piped flow of viscous liquids.

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Published by University of Aston in Birmingham, Dept of Mechanical Engineering in Birmingham .
Written in English


Edition Notes

SeriesPh.D thesis
ID Numbers
Open LibraryOL21899445M

local and relative mean Nusselt number and heat transfer coefficient for pulsated flow to the corresponding ones for steady flow at the same Reynolds numbers. The local heat transfer coefficient and Nusselt number is calculated by varying length . Abstract: In this paper, the problem of magnetohydrodynamic (MHD) viscous flow and heat transfer induced by a shrinking sheet with prescribed surface heat flux is studied. The transformed nonlinear ordinary differential equations are solved via the finite-difference scheme known as the Keller-box method. Both two-. Sometimes viscosity is measured by timing the flow of a known volume of fluid from a viscosity measuring cup. The timings can be used along with a formula to estimate the kinematic viscosity value of the fluid in Centistokes (cSt). The motive force driving the fluid out of the cup is . SOLUTION OF INCOMPRESSIBLE VISCOUS FLUID FLOW WITH HEAT TRANSFER USING ADINA-F KLAUS-J~GEN [email protected] and JIAN DONG~ t Massachusetts Institute of Technology, Cambridge, MA , U.S.A. $ ADINA R&D, Inc., 71 Elton Avenue, Watertown, MA .


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Variations of local heat transfer coefficient in piped flow of viscous liquids. by Michael McIntyre Download PDF EPUB FB2

Although it is possible to mix high-viscosity fluids with simple turbine agitator impellers (if enough are used and at a large enough impeller-to-tank-diameter ratio), if both mixing and heat transfer are required in an agitated vessel, the best choice of impeller is a helical ribbon impeller, i.e., a helix ().This is especially true for laminar flow applications, in which helix impellers are.

For a flow regime of 50⩽Re⩽, the effect of inclination on heat transfer is negligible, but it worth noting the existence of a critical Reynolds number, Re=, above which the effect of. Each has an associated heat transfer coefficient, cross-sectional area for heat transfer, and temperature difference.

The basic relationships for these three processes can be expressed using Equations and ˙Q =h1 A1 (T1- T2) DTo can be expressed as the sum of the DT of the three individual processes. Consideration is given to the influence of viscous dissipation on the thermal entrance region laminar pipe flow heat transfer with convective boundary condition.

The Eigenfunction series expansion technique is employed to solve the governing energy equation. The results for axial distributions of dimensionless bulk and wall temperatures, local Nusselt Cited by: Heat transfer and flow characteristics of different viscous liquids, such as engine Variations of local heat transfer coefficient in piped flow of viscous liquids.

book, automatic transmission fluid, 50% ethylene glycol, and deionized water, were numerically analyzed through a. The enhancement of con- vective heat transfer in single-phase flow of different liquids and low-temperature gases is very important.

At present more and more attention is being paid to this problem []. Here we consider mainly enhance- ment of forced convection heat transfer in viscous fluid by: Beyond drag comparisons, the Reynolds number is also useful for analyzing whether a flow will be laminar or turbulent.

If a fluid follows smooth, predictable streamlines as it flows, it is called laminar (see Box ).If a flow is full of chaotic swirls and eddies, it is called fact, Osborne Reynolds initially developed the index that now bears his name as a way to predict.

The article describes a method for calculating the flow of heat through a wavy boundary separating a layer of liquid from a layer of gas, under the assumption that the viscosity and heat-transfer coefficients are constant, and that a constant temperature of the fixed wall and a constant temperature of the gas flow are given.

A study is made of the equations of motion Author: V. Sokolov. want to study mass/heat transfer in a simple pipe flow.

I want to calculate the local heat flux from the wall and plot it against the pipe length. An idea would be to calculate the heat flow / the mean temperature in a certain slice perpenticular to the axis and then write to a file. Two-phase evaporative heat transfer data were obtained for PEG solutions of moderate viscosities in the range of cP, with heat fluxes of kw/m 2, vapor qualities up toand mass fluxes in the range of kg/m 2 s.

Heat and Mass Transfer Prof. Pradip Dutta Indian Institute of Science Bangalore Problem An uninsulated steam pipe is used to transport high-temperature steam from one building to one another.

The pipe is m diameter, has a surface temperature of C, and is exposed to ambient air at air moves in cross flow over the pipe with a velocity of is. The convection heat transfer coefficient is used when a fluid at a bulk teperature, T sub f, moves past a heat transfer surface at T sub s.

Forced convection heat transfer occurs when the fluid motion is caused by a pump, fan, or blower. Natural o. Esfe and Saedodin [5] estimated convective heat transfer coefficient of MgO/water nanofluid flow in a double pipe heat exchanger at different particle concentrations,and the nanoparticles diameter of 60, 50, 40 and 20 nm.

Aghayari et al. [6] observed heat transfer coefficient and Nusselt number of 19% and. Every book on Heat Transfer gives formulas to calculate h for flowing fluids inside pipes. h for flowing water inside a pipe will be very high, in the order of or more W/m 2.K.

What matters however is not h but the overall heat transfer coefficient U, which in your case will be mainly determined by the PVC pipewall and the transfer of heat from the outer wall to the.

transfer coefficient — the higher the heat transfer coefficient, the greater the efficiency of the system. The overall factor, µ, is dependent on the thermal conductivity of the materials of construction in the area of heat transfer, the resistance to heat transfer of the component being heated or cooled and the resistance to heat transfer File Size: 83KB.

Smallest allowed value of the heat transfer coefficient. The heat transfer coefficients specified through physical signal ports HC1 and HC2 saturate at this value. The default value is 5 W/(m^2*K). The block uses the heat transfer coefficient to calculate the heat transfer rate between fluids 1 and 2 as described in Heat Transfer Rate.

The total heat transfer rate from the hot fluid to the cold fluid in the exchanger is expressed as: Q = UA(LMTD) (7) Calculating the overall heat transfer coefficient at different operating to be constant throughout the exchanger, using Eq. (A.5). Calculating the film heat transfer coefficient for the inner tube side flow.

This volume of the journal “Defect and Diffusion Forum” presents readers with the special issue “Transfer Phenomena in Fluid and Heat Flows V” which contains articles covering theoretical and practical aspects of modeling and numerical investigation of the diffusion in solid materials, diffusive convection, magnetohydromagnetic mixed convective flows and heat transfer.

Combined heat and mass transfer of a viscous fluid along a semi-infinite vertical plate with large suction is studied analytically. Perturbation technique is used as main tool for the analytical approach.

Viscous fluid behavior of heat and mass transfer over a vertical plate with large suction has been considered and its similarity equations have been obtained. Three dimensional viscous flow and heat transfer due to a permeable shrinking sheet with heat generation/absorption R N Jat* & Dinesh Rajotia Department of Mathematics, University of Rajasthan, JaipurIndia *E-mail: [email protected], @ Figure Heat transfer in the coaxial heat exchanger experimental results preceding the U-bend -comparison of several experimental results: Mehta and Bell (solid circles), Ede, this project (open symbols).

33 Figure Heat transfer in the. transfer(borderofareasII andIII). With the advent of convective flows (fig. 2, border between areas I and II) in the layercontaining sensor regularlow-frequencyoscillationsof temperature T. Heat transfer of pipe flows. On the last tab of the heat transfer resistance tool dialog in HTflux you will find a very versatile tool to calculate the heat transfers coefficients (resistances) of pipe flows for gases and liquids.

To get these actual transfer coefficients quite some fluid dynamical calculations are necessary. The local heat-transfer coefficient hx() is defined with the local heat flux q x′ ′ exchanged between the cylinder and the fluid as q x′ ′ ()=hx()()T w −T∞ [] The local heat-transfer coefficient depends on the position of M, the Reynolds and the Prandtl numbers.

The local Nusselt number is proportional to hx(): Nu = h(x)D k [ The variation of the local friction and heat transfer coefficients for flow over a flat plate. The local Nusselt number at a location x for laminar flow over a flat plate may be obtained by solving the differential energy equation to be The local friction and heat transfer coefficients are higher in turbulent flow than they are in laminar flow File Size: 2MB.

In the case of combined heat transfer, it is common practice to relate the total rate of heat transfer (), the overall cross-sectional area for heat transfer (Ao), and the overall temperature ˙Q difference (DTo) using the overall heat transfer coefficient (Uo).The overall heat transfer coefficient combines the heat transfer coefficient of the two heat exchanger fluids and the.

structural relaxation time τ, viscosity η or diffusion coefficient D in viscous liquids is assumed to scale with density ρ and temperature as: F(/ T) (1) where ρ denotes the density, γ is a scaling exponent, T is the temperature and F is a function, which is a priori unknown 5.

The correlation of the exponent γ with. CONVECTIVE HEAT TRANSFER FOR HIGHLY VISCOUS FLUIDS WITH VARIABLE VISCOSITY IN COOLING PIPES. AKIO WADA 1), Convective Heat Transfer, Cooling, Laminar Flow, Highly Viscous Fluid, Variable Viscosity, The maximum velocity deviation from Poiseuille flow is observed clearly at X + ≅ for all viscosity ratios covered in this by: 1.

lated through the tube to extract the heat from the condensing vapor. The heat transfer rate is determined by the tempera- ture rise of the water measured with mercury-in-glass thermometers and by the water flow rate indicated by a calibrated rotameter.

Two iron-constantan thermo- couples in the vapor space of the condenser. Viscous heating in fluids with temperature-dependent viscosity: implications for magma flows The heat generated by viscous friction pro- polymers. In fact, in these fluids, viscous friction generates a local increase in temperature near the tube walls with con-sequent viscosity decrease and increase of the flow velocity.

i'm doing this experiment on heat exchanger. I'm supposed to discuss the effect of changing the flow rate on the overall heat transfer coefficient as well as the effect on the temperature and efficiency. I need some help so anything would be great.

Viscous heating plays an important role in the dynamics of fluids with strongly temperature-dependent viscosity because of the coupling between the energy and momentum equations. The heat generated by viscous friction produces a local temperature increase near the tube walls with a consequent decrease of the viscosity which may dramatically change the Author: A.

Costa, G. Macedonio. viscous flow. Lok et al.[10] studied MHD stagnation point flow towards a shrinking sheet in micropolar fluid. In this paper, the steady three-dimensional MHD boundary layer viscous flow and heat transfer due to a permeable stretching sheet with prescribed surface heat flux is studied in presence of a transverse uniform applied magnetic.

Heat Transfer coefficients – Overal Heat Transfer Coefficient –U. Used for informational reference only. Types: Application: Overall Heat Transfer Coefficient - U - W/(m 2 K) Btu/(ft 2 o F h) Tubular, heating or cooling: Gas at atmospheric pressure inside and outside tubes: 5 - 1 - 6.

The two-dimensional boundary layer flow of a non-Newtonian Casson fluid and heat transfer due to an exponentially permeable shrinking sheet with viscous dissipation is investigated. Using similarity transformations, the governing momentum and energy equations are transformed to self-similar nonlinear ODEs and then those are solved numerically by very efficient shooting Cited by: 8.

So, for a given heat exchanger, fluid flow rates, and characteristics of each area of the exchanger and the overall heat transfer coefficients are fixed (theoretically the overall heat transfer coefficient does vary slightly along the length of the exchanger with temperature as I’ve noted and the U-value will.

Overall heat transfer coefficient U for a heat exchanger depends upon: 1. Area of contact i.e. inner as well as outer surface area of the pipe separating hot and cold fluids → U equation 2. Thermal conductivities of both hot and cold fluid and the.

Correlations for Heat Transfer Coefficients. Each flow geometry requires different correlations be used to obtain heat transfer coefficients.

Initially, we will look at correlations for fluids flowing in conduits. Most correlations will take the "Nusselt form": The correlations that follow are limited to conduit flow without phase change. The fluid deformation physically brings hotter fluid into contact with cooler fluid to enhance the rate of conductive heat transfer between these regions.

In many cases, this occurs in close vicinity to a boundary, and is modeled using a convective heat transfer. Entropy generation for a viscous forced convection through enhanced rough tubes subjected to constant heat flux was numerically investigated.

The entropy generation and exergy destruction due to the flow friction and heat transfer was proposed to evaluate the benefits of the utilization of different enhanced tubes.

The model was based on either. Hi All, I have a situation were I need to evaluate the heat transfer coefficient of a horizontal surface. The surface has tubes within although I first used "flow across a bank of tubes", this has been untrue due to the air flow coming from above the surface flowing vertically (and perpendicular) to the surface.flow of liquids in pipes William Frederick Beckwith Beckwith, William Frederick, "Determination of turbulent thermal diffusivities for flow of liquids in pipes " ().Retrospective Theses and Dissertations.

diffusivities to qualitatively describe the heat transfer characteristics of turbulent flow over a defined range of.The steady two-dimensional flow of a viscous nanofluid of magnetohydrodynamic (MHD) flow and heat transfer characteristics for the boundary layer flow over a nonlinear stretching sheet is considered.

The flow is caused by a nonlinear stretching sheet with effects of velocity, temperature and concentration by: 1.