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Relevant bibliographies by topics / Thermal enhancemen

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Academic literature on the topic 'Thermal enhancemen'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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Journal articles on the topic "Thermal enhancemen"

1

Sameer, Y. Bhosale, and R. Selokar G. "Assessment of Thermal Performance of Non-Conventional Grooved Stepped Shoe Ribs by CFD Technique." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 2 (2019): 75–82. https://doi.org/10.35940/ijeat.B3419.129219.

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In improvement of the thermal performance there is necessity of the heat transfer augmentation. Heat transfer enhancement can be achieved with enlarged or extended surface, impeded boundary level, augmentation in the turbulence etc. It is desired to keep the size of heat exchanger compact for better working conditions. In the proposed work, we made the Computational Fluid Dynamics (CFD) analysis of the non-conventional type of ribs. In this work the non-conventional Stepped grooved shoe shaped ribs were studied by changing its geometry parameters like rib height (15, 20,22mm), thickness of the rib (4, 5,10 mm), and the ratio between these entities. The numerical analysis was done to study change in rate of heat transfer and pressure drop. The effects of variation in staggered arrangements and truncation gap on thermal performance were also studied. It was observed that providing staggered arrangement with truncation gap of 20 mm gives the optimum value of thermal enhancement factor of 1.33

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NAWALE, Prashant R., Atharva A. MULE, Sudesh B. POWAR, and Pramod P. KOTHMIRE. "Enhancement technique of heat transfer using inserted twisted tape." Journal of Thermal Engineering 7, no. 7 (2021): 1614–27. http://dx.doi.org/10.18186/thermal.1025902.

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ÇELIK, Hamdi Selçuk, and L. Berrin ERBAY. "Heat transfer enhancement using different types of turbulators on the heat exchangers." Journal of Thermal Engineering 7, no. 7 (2021): 1654–70. http://dx.doi.org/10.18186/thermal.1025921.

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Lotfizadeh, Saba, and Themis Matsoukas. "Effect of Nanostructure on Thermal Conductivity of Nanofluids." Journal of Nanomaterials 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/697596.

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The presence of colloidal particles is known to increase the thermal conductivity of base fluids. The shape and structure of the solid particles are important in determining the magnitude of enhancement. Spherical particles—the only shape for which analytic theories exist—produce the smallest enhancement. Nonspherical shapes, including clusters formed by colloidal aggregation, provide substantially higher enhancements. We conduct a numerical study of the thermal conductivity of nonspherical structures dispersed in a liquid at fixed volume fraction in order to identify structural features that promote the conduction of heat. We find that elongated structures provide high enhancements, especially if they are long enough to create a solid network (colloidal gel). Cross-linking further enhances thermal transport by directing heat in multiple directions. The most efficient structure is the one formed by hollow spheres consisting of a solid shell and a core filled by the fluid. In both dispersed and aggregated forms, hollow spheres provide enhancements that approach the theoretical limit set by Maxwell’s theory.

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Soumadeep, Chatterjee, and Banerjee Soubhonik. "Graphical Analysis of Heat Transfer Enhancement Techniques Thermal Performance Factor." Research and Applications of Thermal Engineering 3, no. 3 (2021): 1–10. https://doi.org/10.5281/zenodo.4433453.

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<em>Heat transfer enhancements are of several types and have the potential to reduce the size of the equipment. Several researchers have continued studying about this topic and made significant improvements in this field. These innovations have reduced cost and size of devices over time. Many devices are becoming affordable and efficient because of such studies. Hence the Heat Transfer Enhancement techniques are really an important factor in technology. Now an essential parameter in this heat transfer enhancement field is the thermal performance factor, which decides the transfer of heat rate to friction factor. This paper discusses several heat transfer technique’s Thermal Performance Factors and presents them in a graphical manner.</em>

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Oster, Kamil, Christopher Hardacre, Johan Jacquemin, Ana P. C. Ribeiro, and Abdulaziz Elsinawi. "Thermal Conductivity Enhancement Phenomena in Ionic Liquid-Based Nanofluids (Ionanofluids)." Australian Journal of Chemistry 72, no. 2 (2019): 21. http://dx.doi.org/10.1071/ch18116.

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The dispersion of nanoparticles into ionic liquids leads to enhancement of their thermal conductivity. Several papers report on various enhancement values, whereas the comparison between these values with those from theoretical calculations is not always performed. These thermal conductivity enhancements are desired due to their beneficial impact on heat transfer performance in processes requiring the utilisation of heat transfer fluids. Moreover, on the one hand, the theoretical modelling of these enhancements might lead to an easier, cheaper, and faster heat transfer unit design, which could be an enormous advantage in the design of novel industrial applications. On the other hand, it significantly impacts the enhancement mechanism. The aim of this work is to discuss the enhancement of thermal conductivity caused by the dispersion of nanoparticles in ionic liquids, including the analysis of their errors, followed by its theoretical modelling. Furthermore, a comparison between the data reported herein with those available in the literature is carried out following the reproducibility of the thermal conductivity statement. The ionic liquids studied were 1-butyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium ethylsulfate, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, and 1-hexyl-3-methylimidazolium hexafluorophosphate, while carbon nanotubes, boron nitride, and graphite were selected as nanoparticles to be dispersed in the investigated ionic liquids to design novel heat transfer fluids.

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M.V, Bindu, and Herbert Joselin. "Enhancement of Thermal Performance of Solar Parabolic Trough Concentrator-Techniques- Review." Bonfring International Journal of Industrial Engineering and Management Science 9, no. 3 (2019): 16–20. http://dx.doi.org/10.9756/bijiems.9033.

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Ramakrishna, K., and T. Y. Tom Lee. "Evaluation of Thermal Enhancements to Flip-Chip-Plastic Ball Grid Array Packages." Journal of Electronic Packaging 126, no. 4 (2004): 449–56. http://dx.doi.org/10.1115/1.1827260.

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Enhancements to thermal performance of FC-PBGA packages due to underfill thermal conductivity, controlled collapse chip connection (C4) pitch, package to printed wiring board (PWB) interconnection through thermal balls, a heat spreader on the backside of the die, and an overmolded die with and without a heat spreader have been studied by solving a conjugate heat transfer problem. These enhancements have been investigated under natural and forced convection conditions for freestream velocities up to 2 m/s. The following ranges of parameters have been covered in this study: substrate size: 25–35 mm, die size: 6.19×7.81 mm (48 mm2 area) and 9.13×12.95 mm (118 mm2 area), underfill thermal conductivity: 0.6–3.0 W/(m K), C4 pitch: 250 μm and below, no thermal balls to 9×9 array of thermal balls on 1.27 mm square pitch, and with copper heat spreader on the back of a bare and an overmolded die. Based on our previous work, predictions in this study are expected to be within ±10% of measured data. The conclusions of the study are: (i) Thermal conductivity of the underfill in the range 0.6 to 10 W/(m K) has negligible effect on thermal performance of FC-PBGA packages investigated here. (ii) Thermal resistances decrease 12–15% as C4 pitch decreases below 250 μm. This enhancement is smaller with increase in die area. (iii) Thermal balls connected to the PTHs in the PWB decrease thermal resistance of the package by 10–15% with 9×9 array of thermal balls and PTHs compared to no thermal balls. The effect of die size on this enhancement is more noticeable on junction to board thermal resistance, Ψjb, than the other two package thermal metrics. (iv) Heat spreader on the back of the die decreases junction-to-ambient thermal resistance, Θja, by 6% in natural convection and by 25% in forced convection. (v) An overmolded die with a heat spreader provides better a thermal enhancement than a heat spreader on a bare die for freestream velocities up to about 1 m/s. Beyond 1 m/s, a heat spreader on bare die has better thermal performance.

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GÖKSU, Taha Tuna, and Fuat YILMAZ. "Numerical comparison study on heat transfer enhancement of different cross-section wire coils insert with varying pitches in a duct." Journal of Thermal Engineering 7, no. 7 (2021): 1683–93. http://dx.doi.org/10.18186/thermal.1025930.

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Seyed Abbas, Radmard, Alizadeh Hossein Haji Agha, and Seifi Rahman. "Enhancement anaerobic digestion and methane production from kitchen waste by thermal and thermo-chemical pretreatments in batch leach bed reactor with down flow." Research in Agricultural Engineering 64, No. 3 (2018): 128–35. http://dx.doi.org/10.17221/16/2017-rae.

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The effects of thermal (autoclave and microwave irradiation (MW)) and thermo-chemical (autoclave and microwave irradiation – assisted NaOH 5N) pretreatments on the chemical oxygen demand (COD) solubilisation, biogas and methane production of anaerobic digestion kitchen waste (KW) were investigated in this study. The modified Gompertz equation was fitted to accurately assess and compare the biogas and methane production from KW under the different pretreatment conditions and to attain representative simulations and predictions. In present study, COD solubilisation was demonstrated as an effective effect of pretreatment. Thermo-chemical pretreatments could improve biogas and methane production yields from KW. A comprehensive evaluation indicated that the thermo-chemical pretreatments (microwave irradiation and autoclave- assisted NaOH 5N, respectively) provided the best conditions to increase biogas and methane production from KW. The most effective enhancement of biogas and methane production (68.37 and 36.92 l, respectively) was observed from MW pretreated KW along with NaOH 5N, with the shortest lag phase of 1.79 day, the max. rate of 2.38 l·day<sup>–1</sup> and ultimate biogas production of 69.8 l as the modified Gompertz equation predicted.

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Dissertations / Theses on the topic "Thermal enhancemen"

1

Van, Buren Mark Anthony. "Thermal enhancement of urban receiving waters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/NQ38334.pdf.

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Li, Haiying. "Study of thermally reworkable epoxy materials and thermal conductivity enhancement using carbon fiber for electronics packaging." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04062004-164718/unrestricted/li%5Fhaiying%5F200312%5Fphd.pdf.

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Kashfipour, Marjan Alsadat. "Thermal Conductivity Enhancement Of Polymer Based Materials." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron156415885613422.

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Natchimuthu, Chinnaraj Anand. "THERMAL CONDUCTIVITY ENHANCEMENT IN NANOFLUIDS -MATHEMATICAL MODEL." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/758.

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The study on developing a mathematical model for thermal conductivity enhancement in nanofluids was based on formation of nanoparticles into nanoclusters, nanolayer thickness, Brownian motion and volume fraction of nanoclusters. An equation for the thermal conductivity of nanofluids was developed. The expression developed successfully explained the enhanced thermal conductivity of nanofluids and led to some important conclusions. It was found that in this study the nanoparticles tend to form nanoclusters and the volume fraction of the nanoclusters and the trapped fluid in the nanocluster was contributing to the overall thermal conductivity enhancement. Various types of cluster formation was analyzed and it was understood that the nanoparticles forming a spherical nanoclusters are more effective in thermal conductivity enhancement. The contribution of Brownian motion of nanoparticles to the overall thermal conductivity of nanofluids was found to be very small. The study investigated the size distribution of nanoparticles which has been suggested to be an important factor and it gave satisfactory results. The values of the thermal conductivity for different nanofluid combinations were calculated using the expression developed from this study and they agreed with published experimental data. The present model was tested against several nanofluid combinations. To understand the properties that influence the thermal conductivity of nanofluids, parametric studies of a number of nanofluids were carried out. The parameters that were scrutinized to understand themal conductivity enhancement were nanoparticle diameter, nanolayer thickness and brownian motion. From the study, it was observed that Brownian motion is significant only when the particle diameter is less than 10 nm. From the parametric studies the mathematical model derived in this study was validated. The major factor for the thermal conductivity enhancement in nanofluids is the formations of nanoclusters. The combination of the base fluid and nanoparticles to from nanoclusters will provide better cooling solution than the convention cooling fluids.

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Etheredge, Darrell Keith. "MULTIWALL CARBON NANOTUBE ARRAYS FOR THERMAL INTERFACE ENHANCEMENT." UKnowledge, 2012. http://uknowledge.uky.edu/me_etds/3.

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High performance/small package electronics create difficult thermal issues for integrated circuits. Challenges exist at material interfaces due to interfacial contact resistances. Multiwall carbon nanotube (MWCNT) arrays are considered to be excellent candidates for use as thermal interface materials (TIMs) due to outstanding thermal/mechanical properties. In this work, MWCNT array TIMs are analyzed in aluminum and carbon fiber composites via flash diffusivity analysis. The effect of TIM thickness, areal/bulk density, surface cleanliness, and volumetric packing fraction; along with the effect of substrate finish and interfacial contact pressure on thermal performance are analyzed. Trends show the best TIMs possess low thickness, high bulk density and packing fraction, and clean surfaces. Pressure dramatically increases thermal performance after establishing contact, with diminishing returns from additional pressure. Diffusivities approaching 40 mm2/s and 0.65 mm2/s are recorded for aluminum and composite systems. Oxygen plasma etching and high temperature annealing (“Graphitizing”) are investigated as methods to remove amorphous carbon from array surfaces. Graphitized TIMs report diffusivity improvements up to 53.8%. Three methods of incorporating MWCNTs into composites are attempted for thermal/mechanical property enhancement. Conductance calculations show increasing diffusivity without increasing thickness enhances thermal performance in composites. MWCNTs for mechanical property enhancement produce no change, or detrimental effects.

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Teo, Chek Koon. "Digital enhancement of night vision and thermal images." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FTeo%5FChek.pdf.

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Thesis (M.S. in Combat Systems Technology)--Naval Postgraduate School, December 2003.<br>Thesis advisor(s): Monique P. Fargues, Alfred W. Cooper. Includes bibliographical references (p. 75-76). Also available online.

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Whiffen, Thomas Richard. "Thermal mass enhancement for energy saving in UK offices." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/31564/.

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Energy use in buildings accounts for more than a third of global energy demand, with humans seeking to create comfortable internal environments year-round. In the UK, air or water active thermal mass systems have demonstrated viability at delivering energy efficient comfort to office spaces. Whilst an attractive proposition, there are limitations to the cooling capacity and dynamic thermal response, giving rise to overheating in poorly designed buildings. The thesis work presented documents the investigation into active thermal mass enhancement to a prototype ventilated hollow core sample. Through engineering modelling (CFD, Excel VBA and IES) and laboratory (DSC, component and thermal chamber) testing two solutions were tested (an active-PCM module suitable for retrofit and embedded cool water pipes), with results conveying a 1 to 3°C temperature reduction and 0.1 to 0.2 kWh/m2/day AC savings during summer conditions. COP figures up to 10.6 were achieved through temperature set-point controlled water and air activated thermal mass. Economic analysis was conducted with positive results with the active-PCM module becoming viable for the UK’s non-domestic ‘Green Deal’ at a price point of approximately £300 per module. Following the laboratory led, and simulation supported work it was possible to conclude that active thermal mass enhancements can provide financially-viable energy-efficient, thermal-comfort for non-domestic UK properties. However the extent of the benefit depends heavily on the building thermal demands, available technology and optimised system control. Further work should be conducted to; develop additional modelling tools, underpinned by the laboratory data generated, and optimise the novel active-PCM technology, suitable for lucrative target markets.

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Mehdizadeh, Seyedeh Neda. "Enhancement of Kelowna's biosolids to energy conversion with thermal pretreatments." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43563.

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Wei, William Lien Chin. "New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1057.

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Additive manufacturing (AM) is a manufacturing technique that adds material, such as polymers, ceramics, and metals, in patterned layers to build three-dimensional parts for applications related to medicine, aviation, and energy. AM processes for metals like selective laser melting (SLM) hold the unique advantage of fabricating metal parts with complex architectures that cannot be produced by conventional manufacturing techniques. Thermal transport can be a focal point of unique AM products and is likewise important to metal AM processes. This dissertation investigates AM metal meshes with spatially varied thermal conductivities that can be used to maximize the charge and discharge rates for thermal energy storage and thermal management by phase change materials (PCMs). Further, manufacturing these meshes demands excellent thermal control in the metal powder bed for SLM processes. Since the thermal conductivities of metal powders specific to AM were previously unknown, we made pioneering measurements of such powders as a function of gas infiltration. In the past, thermal transport was improved in phase change materials for energy storage by adding spatially homogeneous metal foams or particles into PCMs to create composites with uniformly-enhanced (UE) thermal conductivity. Spatial variation can now be realized due to the emergence of metal AM processes whereby graded AM meshes are inserted into PCMs to create PCM composites with spatially-enhanced (SE) thermal conductivity. As yet, there have been no studies on what kind of spatial variation in thermal conductivity can further improve charge and discharge rates of the PCM. Making such mesh structures, which exhibit unsupported overhangs that limit heat dissipation pathways during SLM processes, demands understanding of heat diffusion within the surrounding powder bed. This inevitably relies on the precise knowledge of the thermal conductivity of AM metal powders. Currently, no measurements of thermal conductivity of AM powders have been made for the SLM process. In chapter 2 and 3, we pioneer and optimize the spatial variation of metal meshes to maximize charge and discharge rates in PCMs. Chapter 2 defines and analytically determines an enhancement ratio of charge rates using spatially-linear thermal conductivities in Cartesian and cylindrical coordinates with a focus on thermal energy storage. Chapter 3 further generalizes thermal conductivity as a polynomial function in space and numerically optimizes the enhancement ratio in spherical coordinates with a focus on thermal management of electronics. Both of our studies find that higher thermal conductivities of SE composites near to the heat source outperform those of UE composites. For selected spherical systems, the enhancement ratio reaches more than 800% relative to existing uniform foams. In chapter 4, the thermal conductivities of five metal powders for the SLM process were measured using the transient hot wire method. These measurements were conducted with three infiltrating gases (He, N2, and Ar) within a temperature range of 295-470 K and a gas pressure range of 1.4-101 kPa. Our measurements indicate that the pressure and the composition of the gas have a significant influence on the effective thermal conductivity of the powder. We find that infiltration with He provides more than 300% enhancement in powder thermal conductivity, relative to conventional infiltrating gases N2 and Ar. We anticipate that this use of He will result in better thermal control of the powder bed and thus will improve surface quality in overhanging structures.

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Lu, Hung-Wei. "Evaluation of Solubilization with Thermal Hydrolysis Process of Municipal Biosolids." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64914.

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The increased demand for advanced sludge stabilization in wastewater treatment facilities over the past decade has led to the implementation of various pretreatment techniques prior to anaerobic digestion. In an attempt to reduce sludge volumes and improve sludge conditioning properties, the use of thermal hydrolysis process before anaerobic digestion has been adopted with an increase in solids destruction, COD removal, and methane gas. In this study, the evaluation of thermal hydrolysis process as a viable pretreatment strategy to anaerobic digestion has been conducted in order to assess its capacity for solids solubilization. Solubilization experiments were conducted at temperatures ranging from 130 to 170℃ and reaction times between 10 and 60 min. Anaerobic biogas production by thermally pre-treated sludge was carried out through a mesophilic anaerobic digester. The results showed that solids solubilization increased with increases in temperature and time, while temperatures above 160℃ for 30 min strongly affected the sludge characteristics. Ammonia production via deamination by thermal hydrolysis was less significant than protein solubilization at a temperature of 170℃. Both protein and carbohydrate solubilization were more dependent on temperature than reaction time. The enhancement of the biogas production was achieved with increases in temperature as pretreatment of 170℃ yielded 20% more biogas than at 130℃. However, it seems the enhancement was linked to the initial biodegradability of the sludge.<br>Master of Science

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Books on the topic "Thermal enhancemen"

1

Hirose, Akira. Beta enhancement of thermal diffusivity in tokamaks. Plasma Physics Laboratory, University of Saskatchewan, 1993.

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Colcombe, S. M. Sensitivity enhancement in aqueous solution thermal lens spectrometry. UMIST, 1997.

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National Institute of Standards and Technology (U.S.), ed. Enhancement of R123 pool boiling by the addition of hydrocarbons. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.

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United States. National Aeronautics and Space Administration., ed. Flow boiling enhancement for thermal management systems: Final report : from the Thermal Science Research Center (TSRC). National Aeronautics and Space Administration, 1998.

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United States. National Aeronautics and Space Administration., ed. Flow boiling enhancement for thermal management systems: Final report : from the Thermal Science Research Center (TSRC). National Aeronautics and Space Administration, 1998.

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Alvin, Smith, and Lyndon B. Johnson Space Center., eds. Flow boiling with enhancement devices for cold plate coolant channel design: Semiannual report. College of Engineering, Prairie View A&M University, 1990.

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Schreiner, Stephen P. Youghiogheny River temperature enhancement protocol for operating Deep Creek hydroelectric station: Model development and results for 1995-2005. Maryland Power Plant Research Program, Maryland Dept. of Natural Resources, 2006.

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Digital Enhancement of Night Vision and Thermal Images. Storming Media, 2003.

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Enhancement of R123 pool boiling by the addition of hydrocarbons. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.

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Enhancement of R123 pool boiling by the addition of hydrocarbons. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1998.

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Book chapters on the topic "Thermal enhancemen"

1

Saha, Sujoy Kumar, Manvendra Tiwari, Bengt Sundén, and Zan Wu. "Effect of Ultrasounds on Thermal Exchange." In Advances in Heat Transfer Enhancement. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29480-3_6.

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Sharma, Naveen, Noushad Shaik, Vivek Kumar, and Mukesh Kumar. "Thermal Efficiency Enhancement of Solar Still Using Fins with PCM." In Thermal Energy Systems. CRC Press, 2023. http://dx.doi.org/10.1201/9781003395768-8.

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Manglik, Raj M. "Enhancement of Convective Heat Transfer." In Handbook of Thermal Science and Engineering. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-26695-4_14.

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Manglik, Raj M. "Enhancement of Convective Heat Transfer." In Handbook of Thermal Science and Engineering. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-32003-8_14-1.

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Xie, Mingfeng, and Yu Wang. "Health-Oriented Walkability Measurement and Enhancement Strategies for Life Circle." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-8401-1_59.

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AbstractWalkability is an important characterization of the degree of pedestrian friendliness in cities, and is also an important element of healthy urban planning. However, due to the heat island effect and climate warming, the poor thermal comfort of walking in summer has seriously hindered residents’ willingness to walk. In this paper, we take Nanhe Community 15-min living circle in Mianyang City, Sichuan Province as an example, simulate the thermal environment in the living circle in summer through ENVI-met software, and calculate the walkability based on the walk score, and simulate the identification of the thermal environment and walkability condition of the living circle. The results show that the overall thermal environment in the study area is poor, especially in the residential and commercial areas where buildings are concentrated, which affects the residents’ willingness to travel, while the thermal environment at the edge of the study area is relatively good due to the factors such as the river. By combining the thermal environment simulation and walkability simulation results, the high walkability-low thermal comfort spaces and low walkability-high thermal comfort spaces are identified. Optimization strategies are proposed for these two types of spaces, in order to provide guidance for the improvement of walkability in the living area.

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Huang, Zhiguang, Guangzhong Wu, Silong Xiao, Shaohua Mel, and Guoqing Xiong. "Techniques for Thermal Storage of Phase Change Metal." In Heat Transfer Enhancement And Energy Conservation. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575726-85.

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Moore, J. P., F. J. Weaver, R. S. Graves, and D. L. McElroy. "The Thermal Conductivity and Expansion Enhancement Associated with Formation of the Superionic State in SrCl2." In Thermal Conductivity 18. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-4916-7_11.

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Zheng, Zhen-Hong, and Zhi-Cheng Huang. "Thermal Performance Improvement of a Flat Plate Solar Collector." In Heat Transfer Enhancement And Energy Conservation. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575726-124.

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Kovářík, Tomáš, Tomáš Křenek, Petr Bělský, and Jaroslav Šesták. "Biomaterials and Nanotechnology Approach to Medical Enhancement." In Hot Topics in Thermal Analysis and Calorimetry. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-45899-1_21.

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Yang, Xiang X., and C. L. D. Huang. "Optimization of Heat Transfer in the Rectangular Fins with Variable Thermal Parameters." In Heat Transfer Enhancement And Energy Conservation. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575726-121.

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Conference papers on the topic "Thermal enhancemen"

1

Hoque, Md Sami Ul, Swapnil Biswas, Md Sadman Sakib, Robert LeAnder, and Scott E. Umbaugh. "Hybrid image enhancement for thermographic imaging in canine bone cancer detection." In Thermosense: Thermal Infrared Applications XLVII, edited by Giovanni Ferrarini, Fernando López, and Peter Spaeth. SPIE, 2025. https://doi.org/10.1117/12.3053308.

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Gebregiorgis, Yonas, Anthony Rizzo, Venkatesh Deenadayalan, et al. "Wide Spectral Modulation in Highly Efficient Thermally Undercut Foundry Fabricated Resonant Modulators." In CLEO: Applications and Technology. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jth2a.98.

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We experimentally investigate optical modulation in thermally undercut microdisk modulators. Optical modulation is realized over a spectral range 6x wider than the resonator’s linewidth due to the enhancement of optically induced thermal nonlinearity.

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Lowrie, David, Peter Rodgers, Valerie Eveloy, and Abdul Roof Baba. "Enhancement of flat-type solar photovoltaics power generation in harsh environmental conditions." In 2014 30th Semiconductor Thermal Measurement & Management Symposium (SEMI-THERM). IEEE, 2014. http://dx.doi.org/10.1109/semi-therm.2014.6892230.

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Rieger, Maximilian, Balakrishnan Nagarajan, Mario Vollmer, and Pierre Mertiny. "Determination of Key Influencing Factors on Thermal Conductivity Enhancement of Graphene Nano-Platelets Reinforced Epoxy." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86847.

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Dispersing micro and nanoparticles into polymeric materials has proven to induce multifunctional properties in polymer composites, including their magnetic, electrical, thermal and mechanical characteristics. Adding carbon-based nanoparticle inclusions such as Graphene Nano-Platelets (GNP) to polymeric materials typically leads to thermal, electrical and mechanical property enhancements. Raising thermal conductivity by adding highly thermally conductive fillers particularly harbors great potential given diverse possible applications, such as in the electronics industry. In this study, the focus is on increasing the thermal conductivity of an epoxy by dispersing GNP in the pre-polymer. The influence of various process parameters such as filler loading, influence of swelling, use of solvent and additives, sonication time and amplitude, as well as curing cycle were determined. By means of a Design of Experiments approach the parameters which have the greatest effect on thermal conductivity enhancement were identified. Through this study a better understanding of the influence of process parameters was achieved in a qualitative and quantitative manner. The study further aids in selecting ideal process parameters for maximum thermal conductivity enhancements.

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Gharagozloo, Patricia E., Ken E. Goodson, and John K. Eaton. "Impact of Thermodiffusion on Temperature Fields in Stationary Nanofluids." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33293.

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The research community has reported a large variety of at times contradictory thermal conductivity enhancements for nanofluids. Some of the differences may result from thermodiffusion, which is the coupled transport of heat and nanoparticles in a temperature gradient. Thermodiffusion can influence the apparent conductivity observed in a given experimental setup. This work explores the potential impact of thermodiffusion on the inconsistencies of the previous results and on the observed temperature dependence of the thermal conductivity enhancement. The thermal conductivity variation with temperature is captured using infrared microscopy. The thermal conductivity distribution varies significantly over the temperature range 27 – 73°C. This work also explores the potential impact of aggregation, gravitational separation, and thermodiffusion on the time-evolution of the thermal conductivity. For 1 percent by volume aluminum oxide in deionized water, this work finds a thermal conductivity enhancement of between 1 and 15 percent depending on temperature and time, which corresponds to an enhancement factor of between 1 and 15. For 0.2 percent by volume carbon nanotubes in silicone oil, this work finds a thermal conductivity enhancement of 8 percent with no dependence on temperature, which corresponds to an enhancement factor of 40.

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Hsu, C. P., N. E. Jewell-Larsen, C. Sticht, I. A. Krichtafovitch, and A. V. Mamishev. "Heat Transfer Enhancement Measurement for Microfabricated Electrostatic Fluid Accelerators." In SEMI-THERM '08. 2008 24th Annual IEEE Semiconductor Thermal Measurement and Management Symposium. IEEE, 2008. http://dx.doi.org/10.1109/stherm.2008.4509362.

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Eveloy, Valerie, Peter Rodgers, and Shrinivas Bojanampati. "Enhancement of photovoltaic solar module performance for power generation in the Middle East." In 2012 IEEE/CPMT 28th Semiconductor Thermal Measurement & Management Symposium (SEMI-THERM). IEEE, 2012. http://dx.doi.org/10.1109/stherm.2012.6188831.

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Shin, Donghyun, Byeongnam Jo, Hyun-eun Kwak, and Debjyoti Banerjee. "Investigation of High Temperature Nanofluids for Solar Thermal Power Conversion and Storage Applications." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23296.

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The aim of this study is to investigate the enhancement of thermal properties of various high temperature nanofluids for solar thermal energy storage application. In concentrating solar power (CSP) systems, the thermo-physical properties of the heat transfer fluids (HTF) and the thermal energy storage (TES) materials are key to enhancing the overall system efficiency. Molten salts, such as alkali nitrates, alkali carbonates, or eutectics are considered as alternatives to conventional HTF to extend the capabilities of CSP. However, there is limited usage of molten salt eutectics as the HTF material, since the heat capacity of the molten salts are lower than that of conventional HTF. Nanofluid is a mixture of a solvent and nanoparticles. Well dispersed nanoparticles can be used to enhance thermo-physical properties of HTF. In this study, silica (SiO2) and alumina (Al2O3) nanoparticles as well as carbon nanotubes (CNT) were dispersed into a molten salt and a commercially available HTF. The specific heat capacity of the nanofluids were measured and applicability of such nanofluid materials for solar thermal storage applications were explored. Measurements performed using the carbonate eutectics and commercial HTF that are doped with inorganic and organic nano-particles show specific heat capacity enhancements exceeding 5–20% at concentrations of 0.05% to 2.0% by weight. Dimensional analyses and computer simulations were performed to predict the enhancement of thermal properties of the nanofluids. The computational studies were performed using Molecular Dynamics (MD) simulations.

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Smith, Sonya T., Mohsen Mosleh, and Khosro A. Shirvani. "Role of Particle Size to Channel Thickness Ratio on Performance of Nanofluids in Micro-Channels." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66860.

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Experimental and numerical investigations were conducted to explore the viability of single-phase nanofluids for microchannel cooling. The experiments were conducted with water/ethylene glycol-based nanofluids to investigate the thermal conductivity enhancement. In the numerical analysis, micro-channels ranged in width from 40 μm to 90 μm with the fixed channel height were considered. Thermal conductivity enhancements of nearly 14% at particle concentration of 0.1% by weight was observed in the experiments. Numerical predictions suggest that design variables (particle size and channel aspect ratio) and thermo-physical properties of the nanofluid have a significant effect on the thermal performance of micro-channel heat sinks. It was shown that at fixed Reynold number, reduction of channel width reduces the hydraulic pressure loss and the heat transfer coefficient, and utilizing nanofluids increases these parameters.

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Harish, S., Kei Ishikawa, Erik Einarsson, et al. "Enhanced Thermal Conductivity of Water With Surfactant Encapsulated and Individualized Single-Walled Carbon Nanotube Dispersions." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75021.

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In the present work, the effective thermal conductivity of single walled carbon nanotube dispersions in water was investigated experimentally. Single-walled carbon nanotubes (SWNTs) were synthesized using the alcohol catalytic chemical vapour deposition method. The diameter distribution of the SWNTs was determined using resonance Raman spectroscopy. Sodium deoxycholate (SDC) was used as the surfactant to prepare the nanofluid dispersions. Photoluminescence excitation spectroscopy (PLE) reveals that majority of the nanotubes were highly individualized when SDC was employed as the surfactant. The nanofluid dispersions were further characterized using transmission electron microscopy, atomic force microscopy (AFM) and optical absorption spectroscopy (OAS). Thermal conductivity measurements were carried out using a transient hot wire technique. Nanotube loading of up to 0.3 vol% was used. Thermal conductivity enhancement was found to be dependent on nanotube volume fraction and temperature. At room temperature the thermal conductivity enhancement was found to be non-linear and a maximum enhancement of 13.8% was measured at 0.3 vol% loading. Effective thermal conductivity was increased to 51% at 333 K when the nanotube loading is 0.3 vol%. Classical macroscopic models fail to predict the measured thermal conductivity enhancement precisely. The possible mechanism for the enhancement observed is attributed to the percolation of nanotubes to form a three-dimensional structure. Indirect effects of Brownian motion may assist the formation of percolating networks at higher temperature thereby leading to further enhancements at higher temperature.

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Reports on the topic "Thermal enhancemen"

1

Serio, Michael A., Erik Kroo, Ripudaman Malhotra, and Donald F. McMillen. Thermal Stability Enhancement of JP-5. Defense Technical Information Center, 1998. http://dx.doi.org/10.21236/ada360085.

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Bishop, Megan, Vuong Truong, Sophia Bragdon, and Jay Clausen. Comparing the thermal infrared signatures of shallow buried objects and disturbed soil. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/49415.

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The alteration of physical and thermal properties of native soil during object burial produces a signature that can be detected using thermal infrared (IR) imagery. This study explores the thermal signature of disturbed soil compared to buried objects of different compositions (e.g., metal and plastic) buried 5 cm below ground surface (bgs) to better understand the mechanisms by which soil disturbance can impact the performance of aided target detection and recognition (AiTD/R). IR imagery recorded every five minutes were coupled with meteorological data recorded on 15-minute intervals from 1 July to 31 October 2022 to compare the diurnal and long-term fluctuations in raw radiance within a 25 × 25 pixel area of interest (AOI) above each target. This study examined the diurnal pattern of the thermal signature under several varying environmental conditions. Results showed that surface effects from soil disturbance increased the raw radiance of the AOI, strengthening the contrast between the object and background soil for several weeks after object burial. Enhancement of the thermal signature may lead to expanded windows of object visibility. Target age was identified as an important element in the development of training data sets for machine learning (ML) classification algorithms.

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Igou, R. E. Programming Enhancements for Low Temperature Thermal Decomposition Workstation. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/12120.

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Bubenik, T. A., R. D. Fischer, G. R. Whitacre, et al. API-WCR Investigation and Prediction of Cooling Rates During Pipeline Maintenance Welding. Pipeline Research Council International, Inc. (PRCI), 1991. http://dx.doi.org/10.55274/r0011852.

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Investigates and improves methods of predicting cooling rates during pipeline maintenance welding. This project was funded by the American Petroleum Institute. The work was performed by Battelle Memorial Institute and Edison Welding Institute. The scope of work included (1) a review of three previous research efforts to develop satisfactory methods for welding appurtenances to in-service pipelines, (2) a review of a pipeline leak and rupture incidents associated with appurtenances, (3) the enhancement of existing analytical models for predicting cooling rates and temperatures during welding on an in-service pipeline, and (4) validation of the thermal-analysis models by performing welds on pipelines carrying three different liquid-petroleum products. The thermal-analysis models can be used to help develop maintenance welding procedures for repair and hot tap welding applications and to reassess the condition of existing installations. This work was cofounded by PRC.

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Bruce and Yushanov. L52056 Enhancement of PRCI Thermal Analysis Model for Assessment of Attachments. Pipeline Research Council International, Inc. (PRCI), 2004. http://dx.doi.org/10.55274/r0010436.

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Welds made onto in-service pipelines tend to cool at an accelerated rate as the result of the flowing content"s ability to remove heat from the pipe wall. These welds are therefore likely to have high heat-affected zone (HAZ) hardness values and to be susceptible to hydrogen cracking. The use of thermal analysis modeling allows welding parameters (i.e., required heat input levels) to be selected based on anticipated weld cooling rates. Both the Battelle model and the recently developed PRCI Thermal Analysis Model for Hot Tap Welding assume that the pipe material is the most susceptible material being welded. Some attachments (e.g., hot formed fittings, etc.) have a significantly less favorable chemical composition (i.e., higher carbon equivalent level) than the pipe material. As a result, for some in-service welding applications, the attachment material may be more susceptible to cracking than the pipe material. Modifications were made to the finite-element solver of the PRCI model to enable hardness prediction in both the pipe and attachment material. The source code for the modified finite-element solver was provided to Technical Toolboxes - PRCI"s commercial partner for software marketing and distribution. The required modifications to the user interface were also developed. In addition, user interface modifications required to rectify a number of faults that were identified and to improve the user interface were also developed. The incorporation of these enhancements and improvements, which are described herein, will require modification by Technical Toolboxes of the Visual Basic-based version of the software that is currently being marketed (V4.2.1). Following the incorporation of these enhancements and improvements, validation trials should be carried out.

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Li, Jian. Contrast Enhancement for Thermal Acoustic Breast Cancer Imaging via Resonant Stimulation. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada525615.

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Duston, Christopher, Steve Seghi, and Roland Watts. Strength Enhancement and Application Development of Carbon Foam for Thermal Protection Systems. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada461309.

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Siegfried, M. Laser-Induced Ionization Efficiency Enhancement On A Filament For Thermal Ionization Mass Spectrometry. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1224031.

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O'Grady, Daniel, Aydin Karahan, Rachel Thomas, et al. Capability Enhancements for System-level thermal Hydraulic Modeling of Lead Fast Reactors. Office of Scientific and Technical Information (OSTI), 2024. http://dx.doi.org/10.2172/2429437.

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Sagaiyaraj, Bernard. Increasing Energy Efficiency of Central Cooling Systems with Engineered Nanofluids. Department of the Built Environment, 2023. http://dx.doi.org/10.54337/aau538344493.

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Buildings consume about 40% of the world’s energy consumption and of that, 65% is dedicated to cooling (or heating) systems. Central building cooling uses water as the main heat transfer medium. The nanoparticle fluid suspension exhibits thermal properties superior to water. The goal was to achieve the highest possible thermal properties with just the right amount of nanoparticles in a uniform and stable dispersion and suspension in water. This engineered nanofluid contains a uniform and stable suspension of graphene nanoparticles (GNP) in water. Using covalent functionalization, centrifugation and high-speed dispersion, the GNP remains in a stable suspension indefinitely. The nanofluid is applied to the closed loop of the chilled water system, where the heat transfer enhancement occurs at the fluid tubes within the evaporator and the tubing in the chilled water coils within the Air Handling Units(AHUs). The Proof of Concept (POC) completed in 2019 using laboratory-derived nanofluid resulted in energy saving that averaged at 32% compared with the baseline fluid (water). In 2022, a Scaled-Up mini plant produced GNP nanofluids in a commercial process environment, showing an average energy savings of 21%. These results were further verified and validated on small chilled water plants outside of the Scaled-Up plant with 25% and 29% average savings.

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