Thermosiphon Reboilers with Enhanced Tubes

Lavrikov, A. V.; Hammerschmidt, Jochen; Kuzma-Kichta, Yury A.; Scholl, Stephan

doi:10.1002/cite.201400056

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Researches on boiling in a single microchannel were conducted for different heating surfaces: clean copper and copper with an artificial nano-relief [10][11][12][13][14][15][16][17]. Experiments were provided in quasi-stationary conditions.…”

Section: Researches On Boiling In Microchannelmentioning

confidence: 99%

Boiling Heat Transfer Enhancement on Micro- and Nanoscales

Kuzma-Kichta¹,

Lavrikov²

2019

dteees

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Microchannel heat exchangers for future electronics, air conditioning systems and heat pipes must provide an extremely high heat flux. Conventional heat transfer enhancement methods may not be applicable due to the small size of these heat exchangers. The present investigation is directed to solve problems of an effective cooling at high heat flux in microchannels and CHF increasing with help of an artificial nanorelief of the surface. The relief is formed by alumina nanoparticles which are deposited on the heating surface of the channel.

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Section: Researches On Boiling In Microchannelmentioning

confidence: 99%

Boiling Heat Transfer Enhancement on Micro- and Nanoscales

Kuzma-Kichta¹,

Lavrikov²

2019

dteees

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“…This submerged condition stabilizes operation in the lower operation range. For the second option the following heat transfer enhancement techniques were investigated for thermosiphon reboilers: swirl‐flow devices: wire matrix inserts 4–7, static mixer inserts, twisted tape inserts, and helically coiled wire inserts 6, extended surfaces: finned tubes 5, treated surfaces: hydrophobic nanoparticle coated tubes 8 and displaced enhancement devices: pillow plates 3, 9. …”

Section: Introductionmentioning

confidence: 99%

Use of Wire Matrix Inserts in Thermosiphon Reboilers in the Lower Operating Range

Lü

Jasch

Scholl

2021

Chemie Ingenieur Technik

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For the assessment of separation technologies from an ecological and economic perspective, a case study was performed to investigate the influence of entrainment on energy and resource demand of a single apparatus and on a single production process. Taking the example of the Rectisol process, the influence of droplet entrainment on individual separation equipment as well as on the process as a whole was identified via flowsheet simulation. Based on the calculated mass and energy balances, an LCA and LCC approach was used for the quantification of the entrainment influence.

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“…The mechanisms underlying enhanced pool boiling heat transfer have been investigated in past few decades for efficient design of reboilers (Thome, 1988;Lavrikov et al, 2015), heat exchangers (Antonelli and O'Neill, 1981;Ohta et al, 2004), power electronics (Kercher et al, 2003;Wei et al, 2009;Sadaghiani et al, 2017;Sinha-Ray et al, 2017;Zhang et al, 2018;Chauhan and Kandlikar, 2019), and other high temperature engineering applications (Konishi and Mudawar, 2015;Mudawar, 2017). This is attributed to high heat transfer efficiencies or heat dissipation exhibited by pool boiling due to the absorption of large amount of latent heat which is accompanied by phase change from liquid to vapor (Kandlikar, 2019;Amalfi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Structure-Property-Boiling Enhancement Mechanisms of Copper/Graphene Nanoplatelets Coatings

et al. 2021

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In this work, we present an exceptionally high heat transfer coefficient (HTC) and critical heat flux (CHF) achieved by graphene nanoplatelets (GNPs) and copper composite coatings with tunable surface properties. These coatings were created by a combination of powder metallurgy and manufacturing processes including ball milling, sintering, electrodeposition, and salt-patterning. We demonstrated correlations between various coating processes, resultant surface morphologies, properties, and improved boiling mechanism. Electrodeposition of GNP and copper particles led to formation of tall ridge-like structures and valleys to contain the boiling fluid in between. Higher CHF achieved for these coatings was attributed to the microlayer evaporation. It was observed that ball milling of GNP and copper particles prior to their sinter-coating enhanced their surface roughness that resulted in very high HTC, nearly 5.4 times higher than plain copper surfaces. Additional salt-patterning along with sinter-coating yielded interconnected porous networks with high nucleating activity that rendered record-breaking HTC of 1,314°kW/m2-°C. Combination of these coating processes can be adopted to tailor the surfaces and achieve better boiling performance. Novel techniques developed in this work can be applied to a variety of thermal engineering applications.

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Thermosiphon Reboilers with Enhanced Tubes

Cited by 5 publications

References 5 publications

Boiling Heat Transfer Enhancement on Micro- and Nanoscales

Boiling Heat Transfer Enhancement on Micro- and Nanoscales

Use of Wire Matrix Inserts in Thermosiphon Reboilers in the Lower Operating Range

Investigation of Structure-Property-Boiling Enhancement Mechanisms of Copper/Graphene Nanoplatelets Coatings

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