scholarly journals Nanofluids for the Next Generation Thermal Management of Electronics: A Review

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1362
Author(s):  
Ana Moita ◽  
António Moreira ◽  
José Pereira
Keyword(s):  
Thermal Management ◽  
Interfacial Flows ◽  
The Novel ◽  
Cooling Systems ◽  
Fluid Mixtures ◽  
Heat Transfer Fluids ◽  
Technological Field ◽  
Thermal Management Of Electronics ◽  
Higher Power ◽  
The Subject

Nowadays, the thermal management of electronic components, devices and systems is one of the most important challenges of this technological field. The ever-increasing miniaturization also entails the pressing need for the dissipation of higher power energy under the form of heat per unit of surface area by the cooling systems. The current work briefly describes the use on those cooling systems of the novel heat transfer fluids named nanofluids. Although not intensively applied in our daily use of electronic devices and appliances, the nanofluids have merited an in-depth research and investigative focus, with several recently published papers on the subject. The development of this cooling approach should give a sustained foothold to go on to further studies and developments on continuous miniaturization, together with more energy-efficient cooling systems and devices. Indeed, the superior thermophysical properties of the nanofluids, which are highlighted in this review, make those innovative fluids very promising for the aforementioned purpose. Moreover, the present work intends to contribute to the knowledge of the nanofluids and its most prominent results from the typical nanoparticles/base fluid mixtures used and combined in technical and functional solutions, based on fluid-surface interfacial flows.

scholarly journals Promising Nanoparticle-Based Heat Transfer Fluids—Environmental and Techno-Economic Analysis Compared to Conventional Fluids

2021 ◽  
Vol 22 (17) ◽  
pp. 9201
Author(s):  
Natalia Czaplicka ◽  
Anna Grzegórska ◽  
Jan Wajs ◽  
Joanna Sobczak ◽  
Andrzej Rogala
Keyword(s):  
Heat Transfer ◽  
Cost Efficiency ◽  
Operating Conditions ◽  
Heat Transfer Fluid ◽  
The Novel ◽  
Cooling Systems ◽  
Correct Operation ◽  
Heat Transfer Fluids ◽  
The Subject ◽  
Materials Used

Providing optimal operating conditions is one of the major challenges for effective heating or cooling systems. Moreover, proper adjustment of the heat transfer fluid is also important from the viewpoint of the correct operation, maintenance, and cost efficiency of these systems. Therefore, in this paper, a detailed review of recent work on the subject of conventional and novel heat transfer fluid applications is presented. Particular attention is paid to the novel nanoparticle-based materials used as heat transfer fluids. In-depth comparison of environmental, technical, and economic characteristics is discussed. Thermophysical properties including thermal conductivity, specific heat, density, viscosity, and Prandtl number are compared. Furthermore, the possible benefits and limitations of various transfer fluids in the fields of application are taken into account.

Pool Boiling of Mixtures for Electronics Thermal Management

2010 ◽  
Author(s):  
Aravind Sathyanarayana ◽  
Yogendra Joshi ◽  
Yunhyeok Im
Keyword(s):  
Heat Transfer ◽  
Thermal Management ◽  
Pool Boiling ◽  
Nanowire Arrays ◽  
Test Surface ◽  
Electronic Components ◽  
Fluid Mixtures ◽  
Heat Transfer Fluids ◽  
Transfer Properties ◽  
Latent Heat Of Vaporization

Electrical and chemical compatibility requirements of electronic components pose significant constraints on the choice of liquid coolants. These constraints have led to the use of fluoroinerts and Novec liquids as coolants, which are plagued by significantly lower thermal conductivity, specific heat, and latent heat of vaporization compared to water, and also a number of these chemicals have significant environmental impact. These factors necessitate the development of new heat transfer fluids with improved heat transfer properties and applicability. Mixture formulations provide an avenue for enhancing the properties of existing heat transfer fluids. These can be tuned for specific applications. Mixture formulations of Novec fluid (HFE 7200) with alcohols and ethers (HFE 7200 and methanol; HFE 7200 and ethoxybutane) are considered in this study. A 1 cm × 1 cm Silicon (Si) sample having copper nanowire arrays is used as the test surface for pool boiling. Experiments are done under saturated conditions and also at different sub-cooled conditions to investigate the thermal performance of these new fluid mixtures. Pool boiling heat transfer performance and the critical heat flux are measured for fluid mixtures and compared with the corresponding base fluid. From the pool boiling experiments, it was observed that adding methanol to pure HFE 7200 enhances the CHF of the resulting mixture and adding ethoxybutane to pure HFE 7200 reduces the incipience temperature for boiling.

Diaghilev and British Writing

2009 ◽  
Vol 27 (1) ◽  
pp. 65-92
Author(s):  
Susan Jones
Keyword(s):  
Visual Arts ◽  
The Body ◽  
The Novel ◽  
Literary Responses ◽  
Literary Aesthetics ◽  
Ballets Russes ◽  
The Arts ◽  
The Subject ◽  
And Gender ◽  
Opening Up

This article explores the diversity of British literary responses to Diaghilev's project, emphasising the way in which the subject matter and methodologies of Diaghilev's modernism were sometimes unexpectedly echoed in expressions of contemporary British writing. These discussions emerge both in writing about Diaghilev's work, and, more discretely, when references to the Russian Ballet find their way into the creative writing of the period, serving to anchor the texts in a particular cultural milieu or to suggest contemporary aesthetic problems in the domain of literary aesthetics developing in the period. Figures from disparate fields, including literature, music and the visual arts, brought to their criticism of the Ballets Russes their individual perspectives on its aesthetics, helping to consolidate the sense of its importance in contributing to the inter-disciplinary flavour of modernism across the arts. In the field of literature, not only did British writers evaluate the Ballets Russes in terms of their own poetics, their relationship to experimentation in the novel and in drama, they developed an increasing sense of the company's place in dance history, its choreographic innovations offering material for wider discussions, opening up the potential for literary modernism's interest in impersonality and in the ‘unsayable’, discussions of the body, primitivism and gender.

DEVELOPMENT OF MINIATURE HEAT PIPES FOR THERMAL MANAGEMENT OF ELECTRONICS IN ISRO SPACECRAFT

2018 ◽  
Author(s):  
Akhil Jaiswal ◽  
A. R. Anand ◽  
Simhachal Rao Chikkala ◽  
Venkata Raghavendra
Keyword(s):  
Thermal Management ◽  
Heat Pipes ◽  
Thermal Management Of Electronics

Le potentiel théâtral chez David Foenkinos. Analyse du roman, du scénario et du film La Délicatesse

2020 ◽  
Vol 65 (2) ◽  
pp. 297-319
Author(s):  
Aluaș Alina
Keyword(s):  
Text Processing ◽  
Careful Analysis ◽  
The Novel ◽  
Work Analysis ◽  
Personal Myth ◽  
The Subject

"The Theatrical Potential in David Foenkinos’ Work. Analysis of the Novel, the Scenario and the Film “La Délicatesse”. Our interest, especially when it comes to the subject of literature, is to show the manner in which the text processing done by the author (script writer/director) brings to light the guidelines of the novelistic text’s semantics, which under careful analysis reveals a kind of personal myth of the novelist. The skewed, syncopated, interrupted writing which disrupts the chronotope serves the needs of the script as well as the director’s selective vision. Unconsciously, the novel seems to follow the structure of the theatrical model. These traits can also be found in the cinematographic structure of the film. Keywords: love, eroticism, delicacy, theatricality, scenario, film. "

HUNTING GWENDOLEN: ANIMETAPHOR INDANIEL DERONDA

2012 ◽  
Vol 40 (1) ◽  
pp. 99-115 ◽  
Author(s):  
Chase Pielak
Keyword(s):  
The Novel ◽  
Daniel Deronda ◽  
Animal Imagery ◽  
The World ◽  
The Subject ◽  
Animal Representations

In George Eliot'sDanielDeronda, animal vitality figures prominently in shaping the human shell, to use an opening animal metaphor. Approaching the significance of the animal leads to a reading of Gwendolen Grandcourt's character as a responsible creature. Gwendolen is Eliot's heroine, one half of the pair of protagonists around whom the novel revolves. Eliot's fantastic character takes shape in three movements, each punctuated by its own animal metaphor: Gwendolen morphs from Lamia to mastered-animal to white doe. Animal imagery appears at the edge of the human, the point at which humanity gains and loses subjectivity, and Gwendolen's novel is fundamentally one of finding her place in the world, her singularity, her responsibility. Images of animals stand in the linguistic gaps – in the places words fail – to figure the subject.1Animals appear at the end of the ability of language to mean. Nevertheless, this analysis is not intended to encompass the complex range of animal representations in George's Eliot's oeuvre, or even to catalog every example inDaniel Deronda. Instead, it suggests the possibility of using animal metaphor as a map for reading a Victorian heroine.

Perimeter Cooling Unit and Localized Row-Based Cooling Unit Transient Air Flow Effects Modeling and Characterization in Data Centers

2015 ◽  
Author(s):  
Tianyi Gao ◽  
James Geer ◽  
Bahgat G. Sammakia ◽  
Russell Tipton ◽  
Mark Seymour
Keyword(s):  
Thermal Management ◽  
Data Center ◽  
Data Centers ◽  
Cooling System ◽  
Air Flow ◽  
Cooling Systems ◽  
Dynamic Thermal Management ◽  
Hybrid Cooling ◽  
Cooling Unit ◽  
Cooling Air

Cooling power constitutes a large portion of the total electrical power consumption in data centers. Approximately 25%∼40% of the electricity used within a production data center is consumed by the cooling system. Improving the cooling energy efficiency has attracted a great deal of research attention. Many strategies have been proposed for cutting the data center energy costs. One of the effective strategies for increasing the cooling efficiency is using dynamic thermal management. Another effective strategy is placing cooling devices (heat exchangers) closer to the source of heat. This is the basic design principle of many hybrid cooling systems and liquid cooling systems for data centers. Dynamic thermal management of data centers is a huge challenge, due to the fact that data centers are operated under complex dynamic conditions, even during normal operating conditions. In addition, hybrid cooling systems for data centers introduce additional localized cooling devices, such as in row cooling units and overhead coolers, which significantly increase the complexity of dynamic thermal management. Therefore, it is of paramount importance to characterize the dynamic responses of data centers under variations from different cooling units, such as cooling air flow rate variations. In this study, a detailed computational analysis of an in row cooler based hybrid cooled data center is conducted using a commercially available computational fluid dynamics (CFD) code. A representative CFD model for a raised floor data center with cold aisle-hot aisle arrangement fashion is developed. The hybrid cooling system is designed using perimeter CRAH units and localized in row cooling units. The CRAH unit supplies centralized cooling air to the under floor plenum, and the cooling air enters the cold aisle through perforated tiles. The in row cooling unit is located on the raised floor between the server racks. It supplies the cooling air directly to the cold aisle, and intakes hot air from the back of the racks (hot aisle). Therefore, two different cooling air sources are supplied to the cold aisle, but the ways they are delivered to the cold aisle are different. Several modeling cases are designed to study the transient effects of variations in the flow rates of the two cooling air sources. The server power and the cooling air flow variation combination scenarios are also modeled and studied. The detailed impacts of each modeling case on the rack inlet air temperature and cold aisle air flow distribution are studied. The results presented in this work provide an understanding of the effects of air flow variations on the thermal performance of data centers. The results and corresponding analysis is used for improving the running efficiency of this type of raised floor hybrid data centers using CRAH and IRC units.

CLASSIFICATION OF RUSSIAN CULTURE-BOUND TERMS AND THEIR EQUIVALENTS BASED ON THE TRANSLATION OF “QUIET FLOWS THE DON” BY M. A. SHOLOKHOV

2020 ◽  
Vol 76 (4) ◽  
pp. 149-155
Author(s):  
SVETLANA S. UZHAKINA ◽  
Keyword(s):  
English Language ◽  
Great Influence ◽  
Political Life ◽  
Daily Routine ◽  
The Novel ◽  
Russian Culture ◽  
The Subject ◽  
Cultural Component ◽  
Historical Epoch

The classification of Russian culture-bound terms used in the novel “Quiet Flows the Don” by M. A. Sholokhov and in its translation into the English language. The novel “Quiet Flows the Don” by M.A. Sholokhov and its translation into English done by Robert Daglish have served as the source for the research of culture-bound terms. These terms have been classified on the basis of the subject division offered by S. Vlakhov and S. Florin. It is proved that the interest to the study of culture-bound terms is still important. The relevance of the research is determined by the fact that despite numerous research papers in this field the origin, classification and translation of these terms still need some investigation. The aim of the present study is to classify the culture-bound terms taken from the novel “Quiet Flows the Don” by M.A. Sholokhon and its translation into the English language. As a result, there have bben taken 407 samples of the lexical units with a cultural component which were classified according to the subject principal offered by S. Vlakhon and S. Florin. The culture-bound terms have a great influence on a foreign reader as they are cultural units that transmit the information of the daily routine and the historical epoch described in the novel. The culture-bound terms taken from the novel “Quiet Flows the Don” by M.A. Sholokhov and its translation are analyzed and classified. The division of the culture-bound terms according to the subject principal allowed to reveal that most terms refer to the daily routine, social and political life and military terms.

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