The present work reports a study of phase split at a horizontal T-junction with main and side branches of 0.005 m diameters. The experiments were confined to the stratified flow pattern and the effects of phase velocities and pressure on the split were examined. The results were also compared with those reported for larger T-junctions.
We introduce a stirred self-stratified battery (SSB) that has an extremely simple architecture formed by a gravity-driven process. The oxidizing catholyte is separated from the reducing Zn anode by a liquid aqueous electrolyte layer. The Coulombic efficiency is always higher than 99%, even when stirring is applied to promote the charge-discharge …
Biphasic self-stratified batteries (BSBs) provide a new direction in battery philosophy for large-scale energy storage, which successfully reduces the cost and simplifies the architecture of redox flow batteries. However, current aqueous BSBs have intrinsic limits on the selection range of electrode materials and energy density due to the …
Stratified thermal energy storage (TES) tanks are widely used in thermal power plants to enhance the electric power peak load shifting capability and integrate …
Nature Communications - Redox flow batteries are promising energy storage systems but are limited in part due to high cost and low availability of membrane …
Else, the solid filler materials act as the primary heat storage medium and the liquid act as the heat transfer medium. Then, the STSHS is called dual-medium sensible heat storage (DMSHS) [6] om ...
A realistic (actual) vertically stratified temperature distribution, and some temperature-distribution models used to approximate it (linear, continuous-linear, general-linear, stepped with 2 ...
Badescu modeled thermal energy storage units based on fully mixed and stratified liquid storage tanks by using three partial differential equations governing the time and space dependence of hot ...
Redox flow batteries are promising energy storage systems but are limited in part due to high cost and low availability of membrane separators. Here, authors develop a membrane-free, nonaqueous 3. ...
Multiphase flow and heat transfer are critical in both traditional and emerging area of engineering research [] and are widely involved in industrial processes and academic studies [2,3], including petrochemical engineering [4,5], chemical engineering [6,7], nuclear engineering [8,9,10], mechanical engineering [11,12], and ocean …
Applied Energy 9 (1981) 231-242 THERMALLY STRATIFIED HOT WATER STORAGE SYSTEMS R. J. WOOD, S. M. AL-MUSLAHI, P. W. O''CALLAGHAN and S. D. PROBERT School of Mechanical Engineering, Cranfield Institute of Technology, Bedford MK43
Abstract. The gas phase accelerating beyond the liquid phase caused by gas-liquid slippage cannot be ignored in short horizontal pipelines with undulation and inflow, and there is no method to calculate it. Therefore, a pressure drop prediction model for variable liquid holdup was developed in this paper. The theoretical model calculation …
The use of electric back-up is necessary to meet the requirements of the consumer if solar energy supply is insufficient to produce hot water (Bouhal et al., 2018) g. 3 shows two vertical storage tanks with different submerged boosters: a top heat exchanger is used as boiler backup for the stratified tank, which is presented in Fig. 3 and an …
In two-phase fluid flow the gravitational force plays very important role, because the fluid with lower density (e.g. gas) is always above the fluid with higher density. Stratified flows are very common in the nature, for example in the ocean and in the atmosphere. In the internal flows the stratified flow occurs at low liquid and gas velocities.
DOI: 10.1016/J.PETROL.2013.06.001 Corpus ID: 98275483 Hydrodynamics model for gas–liquid stratified flow in horizontal pipes using minimum dissipated energy concept @article{Lee2013HydrodynamicsMF, title={Hydrodynamics model for gas–liquid stratified flow in horizontal pipes using minimum dissipated energy concept}, author={Hyun Suk …
Flow-battery technologies open a new age of large-scale electrical energy-storage systems. This Review highlights the latest innovative materials and their technical …
Stratified storage tanks are a promising technology because of their low cost, simplicity and reliability. However, the modeling of the thermocline region in a stratified tank remains a challenge. There is a need to develop a fast and accurate 1D model for simulations and optimizations of TES.
Finally, experi-55 mental data are gathered for comparison and also to act as closure information to the model. Also, CFD simulations have been an important tool in the field of multiphase flows ...
Large-scale energy storage batteries are crucial in effectively utilizing intermittent renewable energy (such as wind and solar energy). To reduce battery …
Stratified tank models are used to simulate thermal storage in applications such as residential or commercial hot-water storage tanks, chilled-water storage tanks, and solar thermal systems. The energy efficiency of these applications relates to the system components and the level of stratification maintained during various flow events in the …
Although this solution remedies some shortcomings of traditional methods in smooth stratified flow, its application in wavy stratified flow needs the other modifications. The examination of turbulence characteristics near the free surface reveals that, in addition to turbulence eddy frequency, the other source function of turbulence kinetic energy …
This proof-of-concept of Li-S BSBs pushes the energy densities of BSBs and provides an idea to realize massive-scale energy storage with large capacitance.
Phillips [57] calculated that stratification can increase the amount of useful energy available by 20% in a rock bed TES with air acting as the heat transport fluid. Lund [58] analysed water tanks and determined that stratified stores resulted in solar fractions higher than those obtained with fully mixed stores by as much as 35–60% for central solar plant …
On October 30, the 100MW liquid flow battery peak shaving power station with the largest power and capacity in the world was officially connected to the grid …
The growing global energy consumption and the transition to the renewable era highlight the urgent need for safe and energy-efficient liquid energy storage tanks. Rollover has been a severe hazard to the efficiency and safety of the storage tank accompanied by significantly enhanced mass and heat transport across the stratified …
Phase change in PCM can take place as solid–liquid, liquid–gas, solid–gas and solid–solid. Many researchers have presented review papers [15,16,17,18] of available latent thermal energy storage systems and …
In today''s world, the energy requirement has full attention in the development of any country for which it requires an effective and sustainable potential to meet the country''s needs. Thermal energy storage has a complete advantage to satisfy the future requirement of energy. Heat exchangers exchange heat in the thermal storage …
Self-stratified battery is a new type of rechargeable battery potentially applicable for large-scale energy storage. It has a thermodynamically stable membrane-free self-stratified architecture which endows the battery with low cost, high cycling stability and excellent safety. In this paper, a novel self-stratified battery based on quinone ...
Abstract. The demand for renewable energy sources is limited by their inherent intermittent nature. The thermal energy storage technique overcomes this shortcoming by allowing storage of naturally occurring energy (e.g. solar) during "non-peak hours". The article presents an experimental investigation of the sparsely studied ''single ...
Thermal Energy Storage (TES), which could use water, oil and molten salt, is a technology used to store the thermal energy for later time use in buildings and industrial processes [4], [5]. Water is considered to be the simplest and most suitable heat transfer and heat storage fluid because of its high volumetric heat capacity, low cost and …
Abstract. Transport of solids produced with oil and gas is desired to avoid flow assurance problems. Stratified flow is a challenging flow regime for solids transport because the solids are trapped in the relatively slow-moving liquid film. Our analysis revealed discrepancies between predictions of existing multiphase models and …
In this paper, an advanced flowrate distribution of the flow entering the tank is developed for modelling stratified storage tanks based on a nodal approach. The …
A promising technology for performing that task is the flow battery, an electrochemical device that can store hundreds of megawatt-hours of energy — enough to keep thousands of homes running for many hours on a single charge. Flow batteries have the potential for long lifetimes and low costs in part due to their unusual design.
The role of the short-term thermal energy storage (STTS), illustrated in Fig. 2, is essentially to serve as the link between the energy supply (i.e. the solar loop), the seasonal storage (i.e. the BTES) and the energy demand (i.e. …
A numerical study on stratified liquid storage tanks Discover the world''s research 25+ million members ... Thermal Energy Storage MEGASTOCK ''97 First Announcement and Call for Pepers Sapporo ...
PNNL researchers plan to scale-up this and other new battery technologies at a new facility called the Grid Storage Launchpad (GSL) opening at PNNL in 2024. The GSL, funded by the Department of Energy''s Office of Electricity, which also funded the current study, will help accelerate the development of future flow battery technology and ...
A Li-S BSB with a high sulfur content (50 mg) was assembled in which contained 1.3 mL electrolyte, and its output energy is 115 mWh under 0.1 C (Fig. 5e). The volume energy density is up to 88.5 ...
The flowing liquid mode in the SSB is different from that in conventional RFBs. The self-stratified structure can tolerate a certain level of disturbance, so the cell can be stirred during operation. Because no separating membrane is used, stirring can directly promote mass transfer between the anode and cathode.
The presence of stratification is well known to improve the performance of stratified thermal energy storage systems (STESS). The major energy and exergy …
Experiments have been carried out on a scale model of stratified hot-water storage tanks to study the effects of operating conditions on the thermoclines and on the extraction efficiency.