Thermal cooling of a cylindrical gas bubble

  • 22 Pages
  • 1.12 MB
  • English
Dept. of Energy, [Office of the Assistant Secretary for Defense Programs], Lawrence Livermore Laboratory, for sale by the National Technical Information Service , [Livermore, Calif.], Springfield, Va
Bubbles -- Mathematical models, Thermal diffusivity,
StatementEdward P. Lee, Lawrence Livermore Laboratory
SeriesUCID ; 17906
ContributionsUnited States. Energy Research and Development Administration, United States. Navy Dept, Lawrence Livermore Laboratory
The Physical Object
Pagination22 leaves ;
ID Numbers
Open LibraryOL14884533M

Get this from a library. Thermal cooling of a cylindrical gas bubble. [Edward P Lee; United States. Energy Research and Development Administration.; United States.

Navy Department.; Lawrence Livermore Laboratory.]. Lithium-ion batteries generally require adequate thermal management to achieve optimal performance and avoid thermal runaway. Compactness and light-we. When the generated vapors enter in the said “domain” in the form of bubbles, mass flow rate of the gas phase in this zone was calculated by (20) m ̇ d e = ∈ G ρ G a i V s V c e l l where, V s is the slip velocity of gas phase with respect to Thermal cooling of a cylindrical gas bubble book, V c e l l is a small differential volume in 1 mm “domain” and a i is the exposed Cited by: The power of electric vehicles (EVs) comes from lithium-ion batteries (LIBs).

LIBs are sensitive to temperature.

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Too high and too low temperatures will affect the performance and. Heat transfer is a study and application of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy and heat between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.

The basic system of equations, representing the energy balance of the nodes of the introduced network is presented as follows.

From the dissipating equipment (temperature T q) with the heat load Q(t), the heat that passes to the evaporator wall through the saddle is (37) Cm q d T q d t = Q q (t)-G q,w (T q-T w,e).

Being received from the saddle, the heat is transferred across the evaporator. A numerical study is presented of the natural frequency of the volume oscillations of gas bubbles in a liquid contained in a finite-length tube, when the bubble is not small with respect to the tube diameter.

Tubes rigidly terminated at one end, or open at both ends, are considered. The open ends may be open to the atmosphere or in contact with a large mass of liquid.

An external cooling scheme including several rows of fan-shaped and cylindrical cooling holes has been designed. By testing different cooling flow rates at a NGV exit Reynolds number of E+06 and Mach number ofdetailed aerodynamic and heat transfer values were obtained destined to assess the design tools for film cooled platforms.

Battery thermal management (BTM) has an important significance for electronic vehicles to keep them operating in a reasonable temperature range and reduce local temperature differ. Int. Heat Mass Transfer. Vol. 16, pp. Pcrgamon Press Printed in Great Britain THEORY OF THE ULTIMATE HEAT TRANSFER LIMIT OF CYLINDRICAL HEAT PIPES* Euratom CCR, Ispra, Italy (Received 22 December and in revised form 10 April ) Abstracthe axial heat flux in heat pipes is limited in principle for two reasons: (1) insufficient.

ANALYTICAL HEAT TRANSFER Mihir Sen Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame, IN May 3,   Thermal performance of cylindrical heat pipe with nanofluid is studied based on the laws of thermodynamics. The objective of the present work is to investigate nanofluids effect on different sources of entropy generation in heat pipe caused by heat transfer between hot and cold reservoirs and also frictional losses and pressure drop in the liquid and vapor flow along heat pipe.

To evaluate the thermal runaway characteristics, the temperature-pressure-time trajectories of commercial cylindrical cells were tested, and it was found that cells at a SoC of greater than 50%.

mode of a cylindrical shell storage tank for petroleum, liquefied hydrocarbon gases, etc., it became possible to ascertain the buckling strength by experiments on a cylindrical shell by applying an internal hydrodynamic pressure, an axial compressive force, and a shear force simultaneously.

Details of these experiments are given in Chapter 3. Problem 9A Thermal conductivity and Prandtl number of a polyatomic gas: Problem 9A Computation of the Prandtl numbers for gases at low density: Problem 9A Thermal conductivity of gaseous chlorine: Problem 9A Estimation of the thermal conductivity of a dense gas: Problem 9A Thermal conductivity of chlorine-air mixtures.

Spray cooling using a mixture of water and air is studied for these applications. It is shown that the heat transfer rate depends on the mass fraction of liquid and that it can be adjusted to a desired value. Experimental heat flux data are presented for different liquid. This book comprises select proceedings of the International Conference on Future Learning Aspects of Mechanical Engineering (FLAME ).

The book gives an overview of recent developments in the field of thermal and fluid engineering, and covers theoretical and experimental fluid dynamics, numerical methods in heat transfer and fluid mechanics, different modes of heat transfer, multiphase.

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Bubble column reactors are characterized by a high liquid content and a moderate phase boundary surface. The bubble column is particularly useful in reactions where the gas-liquid reaction is slow in relation to the absorption rate.

This is the case for gas-liquid reactions with a Hatta number Ha. The cooling process in gas quenching on cylindrical and prismatic single and multiple bodies (the quench charge).

Velocity distributions and uniformity, pressure drop, and flow effects on heat transfer coefficients and product uniformity, as well as recommendation for improved processes, are shown. Gas core reactor rockets are a conceptual type of rocket that is propelled by the exhausted coolant of a gaseous fission nuclear fission reactor core may be either a gas or may be capable of creating specific impulses of 3,–5, s (30 to 50 kNs/kg, effective exhaust velocities 30 to 50 km/s) and thrust which is enough for relatively fast interplanetary travel.

Temperature is one of several factors that affect gas (e.g., bubbles) in solution. Other factors are atmospheric pressure, chemical composition of the solution (e.g., soap), softness or hardness of the water and surface tension.

For carbonated beverages such as champagne, which is fermented in bottles in cool cellars. In the experiments, the working section was filled with bubble bearing water (with hydrating gas bubbles) with a high volumetric gas content (up to 60%).

Carbon dioxide was used as a hydrating gas. HT-7 ∂ ∂−() = −= f TT kA L 2 AB TA TB 0. () In equation (), k is a proportionality factor that is a function of the material and the temperature, A is the cross-sectional area and L is the length of the bar.

In the limit for any temperature difference ∆T across a length ∆x as both L, T A. User Tools. Cart. Sign In. A lumped model of venting during thermal runaway in a cylindrical Lithium Cobalt Oxide lithium-ion cell Article (PDF Available) in Journal of Power Sources –62 March with Reads.

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In the case of a severe accident, natural convection plays an important role in the atmosphere mixing of nuclear reactor containments. In this case, the natural convection might not in the steady-state condition.

Hence, instead of steady-state simulation, the transient simulation should be performed to understand natural convection in the accident scenario within a nuclear reactor containment. Fan et al. [42] proposed a novel cylindrical oblique fin minichannel heat sink fitted over cylindrical heat sources.

Kanargi et al. [43] investigated the behavior of an air-cooled, planar, oblique. Thermal contact resistance is an important parameter in heat conduction of materials that are in contact because it limits rate of heat removal from composite regions in many applications, such as.

Simulation of a copper cylindrical heat pipe was carried out assuming steady state laminar flow, incompressible flow in liquid-wick and ideal gas incompressible flow in vapor section in three.

Film cooling and heat transfer measurements on a cylinder model have been conducted using the transient thermochromic liquid crystal technique. Three showerhead cooling configurations adapted to leading edge film cooling of gas turbine blades were directly compared: “classical” cylindrical holes versus two types of shaped hole exits.

The novel shaped hole is designed to increase the lateral spreading of coolant on the cooling surface. The film-cooling performance of the novel shaped hole is evaluated at a density ratio of and the range of the blowing ratio of –  The propagation of a cylindrical shock wave in a rotational axisymmetric non-ideal dusty gas under the action of monochromatic radiation with increasing energy, which has variable azimuthal and axial components of fluid velocity, is investigated.

As heat energy flows from the hot object to the cold object, the heat energy from your hot water will be transferred to the surrounding cold air inside the fridge once you put the glass jars inside.