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Saturday, May 9, 2020 | History

4 edition of Oscillating flow and heat transfer in a channel with sudden cross section change found in the catalog.

Oscillating flow and heat transfer in a channel with sudden cross section change

Oscillating flow and heat transfer in a channel with sudden cross section change

final report

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  • 19 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English


Edition Notes

StatementMounir Ibrahim and Waqar Hashim.
Series[NASA contractor report] -- NASA CR-199358., NASA contractor report -- NASA CR-199358.
ContributionsHashim, Waqar., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17793603M
OCLC/WorldCa34703059

A change of the widely used SIMPLE algorithm, termed SIMPLE-TP (Time Periodic), was developed to take time periodicity and boundary movements into account. Two different models of heat supply and removal, conduction through the reservoir walls and convection by cross flow, were considered. A Survey of Oscillating Flow in Stirling Engine Heat Exchangers (NASA-CR) A SURVEY OF OSCILLATING FLOg IN STIRLING ENGINE HEAT EXCHANGEHS Annual Contractor Report [Ninnesota Univ.) p CSCL 20D G3/34 N Unclas _ Terrence W. Simon and Jorge R. Seume University of Minnesota Minneapolis, Minnesota March Prepared for File Size: 3MB.

Oscillatory Flow Mechanism for Enhanced Heat Transfer Sultan Taher Raml Follow this and additional works at: Oscillatory Flow Mechanism for Enhanced Heat Transfer study will be useful as a guide for the design and miniaturization of an oscillating device for enhanced heat transfer in further research : Sultan Taher Raml. addition to the phase-change heat transfer due to the oscillating motion in the capillary tube. [5] OHP Design and Operation Akachi initially described the phenomenon he observed as a “self-excited” oscillating heat pipe, as OHPs are a passive two-stage heat transfer device that do not require a mechanical pump for heat transfer.

Internal Flow 17 Summary () • We can combine equations () with () to obtain values of the heat transfer coefficient (see solution of Example ) Ø In the rest of the chapter we will focus on obtaining values of the heat transfer coefficient h, needed to solve the above equationsFile Size: 1MB. Oscillating fluid flow (zero mean) with heat transfer, between two parallel plates with a sudden change in cross section, was examined computationally. The flow was assumed to be laminar and incompressible with inflow velocity uniform over the channel cross section but .


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Oscillating flow and heat transfer in a channel with sudden cross section change Download PDF EPUB FB2

Oscillating flow in channels with changing cross section E). Experimental and analytical results for a straight channel[4], also see Fig. 3, indicate that the flow can be assumed laminar for the two cases.

Due to the lack of experimental evidence for the channel with a sudden change in cross section, the flow is considered by: 4. Oscillating fluid flow (zero mean) with heat transfer, between two parallel plates with a sudden change in cross section, was examined computationally.

The flow was assumed to be laminar and incompressible with inflow velocity uniform over the channel cross section but Cited by: 3. Oscillating fluid flow (zero mean) with heat transfer, between two parallel plates with a sudden change in cross section, was examined computationally.

Over 30 different cases were examined; these cases cover wide ranges of Re sub max ( to 30,), Va (1 to ), expansion ratio (, and ) and A sub r ( to 4).Cited by: 3.

We have computationally examined oscillating flow (zero mean) between two parallel plates with a sudden change in cross section. The flow was assumed to be laminar incompressible with the inflow velocity uniform over the channel cross section but varying sinusoidally with : Mounir Ibrahim and Waqar Hashim.

Almract--In this paper, we have computationally examined oscillating flow (zero mean) between two parallel plates with a sudden change in cross section. The flow was assumed to be laminar incompressible with the inflow velocity uniform over the channel cross section Cited by: 4.

Get this from a library. Heat transfer in oscillating flows with sudden change in cross section. [Mounir B Ibrahim; United States. National Aeronautics and Space Administration.;]. Oscillating fluid flow (zero mean) with heat transfer, between two parallel plates with a sudden change in cross section, was examined computationally.

Over 30 different cases were examined; these cases cover wide ranges of Re sub max ( to 30,), Va (1 to ), expansion ratio (, and ) and A sub r ( to 4).

The oscillations of the flow field in a channel with rectangular cross section and a jump in channel width were investigated using high frequency interferometry. Three different types of flow instability were found to lead to flow oscillations. The description of the periodic concepts on flow and heat transfer in the heating section inserted with V-orifice has rarely been reported.

Therefore, the main objective of this work is to investigate the flow and heat transfer profiles in the square channel inserted with. A comparison was made between the heat transfer performance of oscillating flow through a plate channel without a porous medium and a channel filled with sintered metal foam.

The maximum displacements of oscillating flow were varied from 52 to 68 mm and frequencies of oscillation ranged from 1 to 10 : L.

Jin, K. Leong. Get this from a library. Oscillating flow and heat transfer in a channel with sudden cross section change: final report. [Mounir Ibrahim; Waqar Hashim; United States. National Aeronautics and. In this paper, we have computationally examined oscillating flow (zero mean between) two parallel plates with a sudden change in cross section.

The flow was assumed to be laminar incompressible with the inflow velocity uniform over the channel cross section but varying sinusoidally with time.

The cases studied cover wide ranges of Remax (from to ), Va (from 1 to ), the expansion Cited by: 4. MHD OSCILLATORY SLIP FLOW AND HEAT TRANSFER IN A CHANNEL FILLED WITH POROUS MEDIA Samuel Olumide ADESANYA1, Oluwole Daniel MAKINDE2 This paper deals with the effect of slip on the hydromagnetic pulsatile flow through a channel filled with saturated porous medium with time dependent boundary condition on the heated Size: 87KB.

There are two modes of heat transfer with the oscillating flow: 1) single phase convective heat transfer from the oscillating fluid, and 2) evaporation and condensation heat transfer of the liquid and vapor. The heat spreading process is best visualized by looking at a small volume of fluid in a single tube as shown in the sketch at right.

Heat transfer is from the stationary concentric tubular electric heating element outer surface to the reciprocating flow.

The heat transfer in an oscillating vertical annular fluid column flowing. However, studies relevant to channel heat transfer enhancement due to a transversely oscillating structure are rather rare.

Yang numerically investigated heat transfer from channel walls under the influence of a transversely oscillating square cylinder, and has reported enhanced heat transfer with increased oscillation by:   Most commercial CFD codes can model heat transfer as part of the flow solution, so you can get the temperature distribution along with the flow distribution.

If the HX is large, a small portion of it can be modeled and an overall heat transfer coefficient can be calculated. Power dissipation and time-averaged pressure in oscillating flow through a sudden area change June The Journal of the Acoustical Society of America (5) In this study, numerical simulations are conducted to investigate the effects of pin fin and dimple shape on the flow structure and heat transfer characteristics in a rectangular channel.

The studied shapes for dimple and pin fin are circular, spanwise-elliptical, and streamwise-elliptical, by: 2. heat transfer in pipes and ducts, internal flow, review fluid mechanics.

HEAT TRANSFER IN CHANNEL FLOW Introduction (1) Laminar vs. turbulent flow Extends from the inlet to the section where the boundary layer thickness reaches the center of channel.

(2) Fully developed region. Determination of Heat Transfer Coefficient and Nusselt Number h(x) Nu D Scale Analysis 0 T m T s q sc r r o.Abstract: Heat exchangers in Stirling engines and many other reciprocating machines operating under conditions of both oscillating pressure and oscillating flow are discussed.

Experiments were done on an apparatus consisting of a piston-cylinder space connected to an annular dead-end heat exchanger space.

Instantaneous heat flux and center gas temperature were measured at six locations along.merical simulation of flow and. heat transfer by forced convection in a horizontal channel. with three blocks attached to its bottom wall.

The blocks. simulate electronic components. In order to enhance heat. transfer, a rectangular cross section control eleme.

nt, acting as. a vortex generator, has been attached to the channel top wall.