Subcooling
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Solar Still Efficiency Enhancement by Using Graphene Oxide/Paraffin Nano-PCM Open
Solar-driven water desalination technologies are rapidly developing with various links to other renewable sources. However, the efficiency of such systems severely depends on the design parameters. The present study focused on using graphe…
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Subcooling methods for CO2 refrigeration cycles: A review Open
CO2 subcooling has resulted a method to upgrade the performance of CO2 refrigeration plants in the recent years, with overall improvements up to 12% with internal heat exchangers, 22% with economizers, 25.6% with thermoelectric systems and…
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Hierarchical Superhydrophobic Surfaces with Micropatterned Nanowire Arrays for High-Efficiency Jumping Droplet Condensation Open
Self-propelled droplet jumping on nanostructured superhydrophobic surfaces is of interest for a variety of industrial applications including self-cleaning, water harvesting, power generation, and thermal management systems. However, the un…
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Pectin as an Extraordinary Natural Kinetic Hydrate Inhibitor Open
Pectin as a novel natural kinetic hydrate inhibitor, expected to be eco-friendly and sufficiently biodegradable, was studied in this paper. The novel crystal growth inhibition (CGI) and standard induction time methods were used to evaluate…
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A review of advances in freeze desalination and future prospects Open
Freeze desalination (FD) has several benefits compared to vaporization-based and membrane-based desalination methods. The FD process needs approximately 1/7th of the latent heat required by the vaporization-based desalination processes. Th…
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Characterization of Nonequilibrium Condensation of Supercritical Carbon Dioxide in a de Laval Nozzle Open
Carbon capture and storage could significantly reduce carbon dioxide (CO2) emissions. One of the major limitations of this technology is the energy penalty for the compression of CO2 to supercritical conditions. To reduce the power require…
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Exceptional Anti-Icing Performance of Self-Impregnating Slippery Surfaces Open
A heat exchange interface at subzero temperature in a water vapor environment exhibits high probability of frost formation due to freezing condensation, a factor that markedly decreases the heat transfer efficacy due to the considerable th…
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Sustaining enhanced condensation on hierarchical mesh-covered surfaces Open
Controlling the solid–liquid–vapor tri-phase interface is of fundamental importance for a broad range of industrial applications including biomedical engineering, energy production and utilization, environmental control, water production, …
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Annual performance of a supermarket refrigeration system using different configurations with CO2 refrigerant Open
The recent regulation concerning the ban of the hydro-fluorocarbon (HFC) refrigerants has led to the employment of environmentally friendly solutions for refrigeration. Systems that employ CO2 seem to be a viable option which is compatible…
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Critical Heat Flux in Flow Boiling—Review of the Current Understanding and Experimental Approaches Open
A comprehensive review of current literature on subcooled flow boiling with a focus on the mechanistic modeling of the departure from nucleate boiling is presented. This review covers parametric trends, other reviews on the topic, previous…
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Gas Hydrate Formation Probability Distributions: The Effect of Shear and Comparisons with Nucleation Theory Open
Gas hydrate formation is a stochastic phenomenon of considerable significance for any risk-based approach to flow assurance in the oil and gas industry. In principle, well-established results from nucleation theory offer the prospect of pr…
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Flow boiling characteristics in plain and porous coated microchannel heat sinks Open
Flow boiling heat transfer enhancement using porous coatings in microchannels has been experimentally investigated with HFE-7200. Results of the coated microchannel heat sink were compared to baseline results in a plain, micro-milled coppe…
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Synergic Kinetic Inhibition Effect of EMIM-Cl + PVP on CO2 Hydrate Formation Open
Kinetic hydrate inhibitors (KHIs) are employed to mitigate gas hydrate formation in pipelines at low concentrations. Ionic liquids and conventional available KHIs (polymers) perform poorly at high subcooling and extended shut-in conditions…
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Embedded Two-Phase Cooling of High Flux Electronics Via Press-Fit and Bonded FEEDS Coolers Open
The increasing heat densities in electronic components and focus on energy efficiency have motivated utilization of embedded two-phase cooling, which reduces system-level thermal resistance and pumping power. To achieve maximum benefit, hi…
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Flow Boiling of Water in a Rectangular Metallic Microchannel Open
The article presents the experimental results of flow boiling of water in single rectangular microchannels. Three rectangular copper microchannels having the same hydraulic diameter (0.56 mm) and length (62 mm) but different aspect ratios …
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Axisymmetric lattice Boltzmann model for simulating the freezing process of a sessile water droplet with volume change Open
Droplet freezing not only is of fundamental interest but also plays an important role in numerous natural and industrial processes. However, it is challenging to numerically simulate the droplet freezing process due to its involving a comp…
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Experimental assessment of dedicated and integrated mechanical subcooling systems vs parallel compression in transcritical CO2 refrigeration plants Open
Mechanical subcooling systems, both dedicated and integrated, have attracted lot of attention in the recent years
\ndue to their great potential to improve transcritical CO2 refrigeration systems. Numerous studies have theoretically determ…
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Numerical modelling of fuel spray formation and collapse from multi-hole injectors under flash-boiling conditions Open
Flash-boiling of fuel sprays can occur when the fuel enters a metastable superheated state, which is common in direct-injection spark-ignition engines operating at low in-cylinder pressures and/or hot fuel temperatures. The effect of flash…
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Implementing Superhydrophobic Surfaces within Various Condensation Environments: A Review Open
Steam condensation is omnipresent, and inevitable in many industrial processes. A classic example is seen within condensers that are used to liquify various gasses. In consequence, water‐vapor is eventually deposited upon the exterior of h…
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An application of the non-continuous Trefftz method to the determination of heat transfer coefficient for flow boiling in a minichannel Open
The paper presents an application of the semi-analytical method, called the non-continuous Trefftz method, to the calculation of the heat transfer coefficients. It is very effective method for solving direct and inverse problems. The resul…
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Reduction of the subcooling of bischofite with the use of nucleatings agents Open
The use of by-products or wastes as phase change materials (PCM) in thermal energy storage (TES) systems is a good option to decrease the cost of such systems. One of the main disadvantages of PCM if inorganic materials are used is subcool…
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Thermodynamic Performance Analysis of CO2 Transcritical Refrigeration Cycle Assisted with Mechanical Subcooling Open
The thermal performance of CO2 transcrtical refrigeration cycle can be improved by cooling the CO2 fluid exiting the gas cooler with an assisted vapor compression refrigeration cycle (auxiliary cycle). Thus, a thermodynamic analysis is per…
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Improving Performance of Cold-Chain Insulated Container with Phase Change Material: An Experimental Investigation Open
The cold-chain transportation is an important means to ensure the drug and food safety. An cold-chain insulated container incorporating with Phase Change Material (PCM) has been developed for a temperature-controlled transportation in the …
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Microlayer dynamics during the growth process of a single vapour bubble under subcooled flow boiling conditions Open
The phenomena of microlayer formation and its dynamic characteristics during the nucleate pool boiling regime have been widely investigated in the past. However, experimental works on real-time microlayer dynamics during nucleate flow boil…
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Oscillate boiling from microheaters Open
We report about an intriguing boiling regime occurring for small heaters\nembedded on the boundary in subcooled water. The microheater is realized by\nfocusing a continuous wave laser beam to about $10\\,\\mu$m in diameter onto a\n165\\,nm…
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Reduction of Clathrate Hydrate Film Growth Rate by Naturally Occurring Surface Active Components Open
During the production of offshore oil and gas, the cooling of hydrocarbons toward seafloor temperatures enables the formation of gas hydrates, which may restrict fluid flow and ultimately block the flowline. During the formation of a hydra…
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Premelting-Induced Agglomeration of Hydrates: Theoretical Analysis and Modeling Open
Resolving the long-standing problem of hydrate plugging in oil and gas pipelines has driven an intense quest for mechanisms behind the plug formation. However, existing theories of hydrate agglomeration have critical shortcomings, for exam…
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Rewetting and boiling in jet impingement on high temperature steel surface Open
Interface topologies and boiling phenomena are observed within the water jet impingement zone during quenching of a high temperature (300 °C–900 °C) steel plate by direct optical observations. Stable film boiling may occur, but surface asp…
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Performance evaluation of CO2 supermarket refrigeration system with multi-ejector and dedicated mechanical subcooling Open
In this paper, a CO2 supermarket refrigeration system using multi-ejector and dedicated mechanical subcooling (MEJ + DMS) is proposed to solve the problem of low performance of the CO2 refrigeration system in high temperature area and eval…
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Preferred Mode of Atmospheric Water Vapor Condensation on Nanoengineered Surfaces: Dropwise or Filmwise? Open
Condensing atmospheric water vapor on surfaces is a sustainable approach to addressing the potable water crisis. However, despite extensive research, a key question remains: what is the optimal combination of the mode and mechanism of cond…