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Sunday, July 26, 2020 | History

2 edition of Heat transfer coefficients for pulsating flow in a pipe. found in the catalog.

Heat transfer coefficients for pulsating flow in a pipe.

Gordon Long

Heat transfer coefficients for pulsating flow in a pipe.

by Gordon Long

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  • 2 Currently reading

Published .
Written in English


Edition Notes

Thesis (Ph. D.)--TheQueen"s University of Belfast, 1961.

The Physical Object
Pagination1 v
ID Numbers
Open LibraryOL20336248M

Among the different kinds of heat pipes, the Pulsating Heat Pipe represents one of the most promising and effective passive heat transfer system, which has emerged in contemporary time due to its performance, versatility, and construction simplicity.   Parison of laminar turbulent flow heat transfer coefficient laminar pulsating pipe air flow 17 2 bined conduction and convection transferencia de calor Fully Developed Pipe Flow With Heat Transfer QuickersimSolved A Determine If The Flow Is Laminar Transitional CheggForced Convection Entry Region Circular Pipe Heat Transfer Equation And Calculator .

improve heat transfer coefficient and reduce operating cost. Keywords: Pulsating flow, Heat transfer enhancement, Turbulent flow, Pulsator. 1. Introduction 1The effect of pulsation on heat transfer remains a problem of interest to researchers due to its wide existence in industry. The operation of modern power-. Correlations for Laminar Forced Convection in Flow Over an Isothermal Flat Plate and in Developing and Fully Developed Flow in an Iso- Thermal Tube.

It’s the two phase heat transfer device suitable for low power applications such as electronic cooling. Even the name is heat pipe,but working is very much different than the conventional heat pipes. It has capillary which has many bends (capillar. Related Resources: heat transfer. Convective Heat Transfer Coefficients Table Chart. Heat Transfer Engineering Thermodynamics. Convective Heat Transfer Coefficients Table Chart The following table charts of typical convective convection heat transfer coefficients for fluids and specific applications. Typical values of heat transfer coefficient.


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Heat transfer coefficients for pulsating flow in a pipe by Gordon Long Download PDF EPUB FB2

Spatiotemporal variation of turbulent heat transfer in a pipe was measured against flow acceleration or deceleration.

• Delay of the heat transfer against the acceleration or deceleration was characterized using time-lag Δt and time constant τ. • Δt and τ can be expressed as non-dimensional forms using wall friction velocity. A heat pipe is a heat-transfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces.

At the hot interface of a heat pipe, a liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface.

The vapor then travels along the heat pipe to the. The heat transfer coefficient or film coefficient, or film effectiveness, in thermodynamics and in mechanics is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ΔT).

The overall heat transfer rate for combined modes is usually expressed in terms of an overall conductance or heat transfer. Heat transfer characteristics of pulsating turbulent air flow in a pipe heated at uniform heat flux were experimentally investigated.

The experiments were performed over a range of 10 4 Cited by: pulsating flow in a tube and found that the heat transfer of the flow has increased in the frequency range between 5 Hz to 25 Hz. The enhancement was more pronounced at higher Prandtl number. Shahin investigated the convective heat transfer in a pipe and in the annulus between two concentric tubes both experimentally and theoretically.

Heat transfer behind a rib in pulsating flows was studied using an experimental setup schematically shown in Fig. setup included a smoothly shaped inlet (position 1 in Fig.

1) and a test section (pos. 3), which was a × m 2 rectangular channel with the length of m. An aluminum square rib (pos. 6) was installed on one of the m wide walls at the. Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase ers also consider the transfer of mass of.

Heat transfer characteristics to turbulent pulsating pipe flows under a wide range of Reynolds number and pulsation frequency were experimentally investigated under uniform heat flux condition.

Reynolds number was varied from to while the frequency of pulsation ranged from 1 to Hz. The results showed that the relative mean Nusselt number is. This broad change in the heat transfer coefficient is largely due to the change of flow patterns.

The mean heat transfer coefficient of W / (m 2 K) in present study is corresponding to the slug flow pattern. Download: Download high-res image (KB) Download: Download full-size image; Fig. The mean heat transfer coefficient of.

Determine the overall heat transfer coefficient 'U' for heat transfer occurring from superheated steam in a steel pipe to atmosphere, with the following conditions. Pipe nominal size = 8" pipe schedule = STD Average steam temperature over the pipe length = 0 C Ambient air temperature = 22 0 C heat transfer coefficient on steam side = h S.

the convection heat transfer coefficient for laminar pipe flow. • Be able to use the correlations discussed in this course to calculate a value for the convection heat transfer coefficient for turbulent flow through non- circular ducts.

• Be able to use the correlations discussed in this course to calculate a value for. 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 effect of working fluid on the start-up and thermal performance in terms of thermal resistance and heat transfer coefficient of a pulsating heat pipe have been studied in the present paper.

Methanol and de-ionized water has been selected as the working fluid. The minimum startup power for DI water was obtained at 50% filling ratio and for methanol at 40%. studies of pulsating flow and heat transfer through a porous medium are relatively scarce and often incom- plete.

Recently, Kim et al. [14] simulated the pulsating flow and heat transfer in a channel filled with a porous medium. Khodadadi [ treated analytically an oscil- latory flow through a porous medium channel boun.

The heat transfer coefficient evaluated in this case is referred to as the external heat transfer coefficient. With the above assumption, if we look closely at the wall (if the thickness of the wall is defined across the y direction, and y = 0 represents the surface/plane of the wall), it’s clear that the No Slip condition at the wall results.

Said et al. [7] have investigated flow and heat transfer characteristics of pulsating flow downstream of an abrupt expansion for different frequencies (5. In this paper, the flow and heat transfer of pulsating flow under low vibrational Reynolds number in a transverse tube were studied through numerical simulation method.

The results showed that: the sine (or cosine) fluctuation of outlet pressure was produced by pulsating flow, furthermore, the fluctuate scope increased with increasing amplitude and frequency of pulsating flow. The only part of the overall heat-transfer coefficient that needs to be determined is the convective heat-transfer coefficients.

Correlations are used to relate the Reynolds number to the heat-transfer coefficient. The Reynolds number is a dimensionless ratio of the inertial and viscous forces in flow. investigation to pulsating pipe flow with different amplitude was carried out by Guo et al.

[15]. In case of book properties of air which is ×10−6 = 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. For realizing effective vibration excitation and control, a new vortex generator (VG) is proposed. Based on a two-step calculation strategy, the flow-induced vibration responses of.

The convective heat transfer coefficient for the air is 18 Btu/hr-ft 2 - o F. Calculate the heat transfer rate from the pipe into the room if the room temperature is 72 o F. Many applications involving convective heat transfer take place within pipes, tubes, or .Heat transfer characteristics of pulsating turbulent air flow in a pipe heated at uniform heat flux were experimentally investigated.

The experiments .5 Heat Exchangers The general function of a heat exchanger is to transfer heat from one fluid to another. The basic component of a heat exchanger can be viewed as a tube with one fluid running through it and another fluid flowing by on the outside.