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Relevant bibliographies by topics / Vertical knowledge transfer

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Academic literature on the topic 'Vertical knowledge transfer'

Author: Grafiati

Published: 3 June 2025

Last updated: 19 July 2025

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Journal articles on the topic "Vertical knowledge transfer"

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Urbancová, Hana, and Martina Fejfarová. "Vertical knowledge transfer in Czech organizations." Business: Theory and Practice 16, no. (3) (2015): 231–42. https://doi.org/10.3846/btp.2015.477.

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For organizations the losing key employees is the greatest threat; if the organizations lose the key workers, they cannot use their premises, data, information and other resources. The article aims at evaluation of the level of vertical knowledge transfer in organizations in the Czech Republic. The partial goals of this article are to determine dependencies between the examined qualitative features. The article has been drawn up using scientific methods, in particular logical methods, such as analysis, synthesis, induction, deduction and comparison. The results were obtained from longitudinal quantitative research in organizations in the Czech Republic from 2010 to 2014. The article identifies the factors affecting vertical knowledge transfer and presents a method of eliminating the risk of losing key knowledge workers. Vertical knowledge transfer is a new supporting factor of organizations' productivity and business continuity.

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Urbancová, Hana, and Martina Fejfarová. "Vertical knowledge transfer in Czech organizations." Verslas: Teorija ir Praktika 16, no. 3 (2015): 231–42. http://dx.doi.org/10.3846/btp.2015.477.

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For organizations the losing key employees is the greatest threat; if the organizations lose the key workers, they cannot use their premises, data, information and other resources. The article aims at evaluation of the level of vertical knowledge transfer in organizations in the Czech Republic. The partial goals of this article are to determine dependencies between the examined qualitative features. The article has been drawn up using scientific methods, in particular logical methods, such as analysis, synthesis, induction, deduction and comparison. The results were obtained from longitudinal quantitative research in organizations in the Czech Republic from 2010 to 2014. The article identifies the factors affecting vertical knowledge transfer and presents a method of eliminating the risk of losing key knowledge workers. Vertical knowledge transfer is a new supporting factor of organizations’ productivity and business continuity.

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Castro, Rita, and António Carrizo Moreira. "Mapping Internal Knowledge Transfers in Multinational Corporations." Administrative Sciences 13, no. 1 (2023): 16. http://dx.doi.org/10.3390/admsci13010016.

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Managing multiple knowledge transfers between headquarters and subsidiaries, among subsidiaries, and also within each of these units is crucial for multinational corporations’ (MNCs) survival. Therefore, this article aims to uncover the main factors influencing internal knowledge transfers in MNCs—including intra-unit knowledge transfers and transfers between units, namely, conventional, horizontal, and reverse knowledge transfers. To achieve this goal, a systematic literature review (SLR) was conducted to synthesize the content of 85 articles. From a set of 1439 papers, only 85 related to knowledge transfer and knowledge sharing were considered. Based on an inductive thematic approach, eight different research categories and 97 topics were identified. Four different internal knowledge transfers (intra knowledge transfer (IKT), horizontal knowledge transfer (HKT), conventional knowledge transfer (CKT), and reverse knowledge transfer (RKT)) are compared across eight thematic categories and 97 topics. According to the results obtained, the depth of the topics analyzed varies, as does the variety of categories, with RKT being more deeply analyzed than IKT. There is a clear dominance of vertical knowledge transfer (CKT + RHT) over HKT. The exercise of power (e.g., size, knowledge base) still dominates CKT and RKT in most of the studies analyzed, which are traditionally affected by the characteristics of MNCs, HQs and subsidiaries. The debate on HKT is affected by the classical perspectives of power-based relations (e.g., expatriates, size, knowledge base) among subsidiaries. Although important, intra-unit knowledge transfer is greatly influenced by characteristics.

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Giencke, Anneli. "Vertical Studio." Cubic Journal, no. 4 (November 1, 2021): 100–107. http://dx.doi.org/10.31182/cubic.2021.4.041.

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Since 2016 the Environmental and Interior Design Programme (E&I), School of Design, The Hong Kong Polytechnic University, has implemented an educational model called the vertical studio. Until now, the vertical studio model has become an instrumental peer-to-peer learning scheme while enhancing students' competency in digital literacy. A first of its kind within the design education context of Asia, the vertical studio model has contributed to advance design education practices, embracing collaborative learning opportunities, and facilitate knowledge and skills transfer of drawing techniques, technology, and digital proficiency.

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Gao, Dashan, Sheng Wan, Lixin Fan, Xin Yao, and Qiang Yang. "Complementary Knowledge Distillation for Robust and Privacy-Preserving Model Serving in Vertical Federated Learning." Proceedings of the AAAI Conference on Artificial Intelligence 38, no. 18 (2024): 19832–39. http://dx.doi.org/10.1609/aaai.v38i18.29958.

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Vertical Federated Learning (VFL) enables an active party with labeled data to enhance model performance (utility) by collaborating with multiple passive parties that possess auxiliary features corresponding to the same sample identifiers (IDs). Model serving in VFL is vital for real-world, delay-sensitive applications, and it faces two major challenges: 1) robustness against arbitrarily-aligned data and stragglers; and 2) privacy protection, ensuring minimal label leakage to passive parties. Existing methods fail to transfer knowledge among parties to improve robustness in a privacy-preserving way. In this paper, we introduce a privacy-preserving knowledge transfer framework, Complementary Knowledge Distillation (CKD), designed to enhance the robustness and privacy of multi-party VFL systems. Specifically, we formulate a Complementary Label Coding (CLC) objective to encode only complementary label information of the active party's local model for passive parties to learn. Then, CKD selectively transfers the CLC-encoded complementary knowledge 1) from the passive parties to the active party, and 2) among the passive parties themselves. Experimental results on four real-world datasets demonstrate that CKD outperforms existing approaches in terms of robustness against arbitrarily-aligned data, while also minimizing label privacy leakage.

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Shang, Qingyan, and Jessie P. H. Poon. "INTERNATIONAL SPILLOVERS, KNOWLEDGE ACQUISITION AND TRANSFER AMONG JAPANESE FIRMS IN THE UNITED STATES." Journal of Business Economics and Management 14, no. 3 (2012): 535–57. http://dx.doi.org/10.3846/16111699.2012.658853.

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In this paper, we investigate (i) the relationship between international spillovers and knowledge acquisition, and, (ii) intra-firm subsidiary-to-parent transfer of technology among Japanese firms in the United States. Using a survey of 185 firms, probit regressions reveal that R&D personnel and market power significantly influence the acquisition of knowledge associated with basic and applied science and product development. Tacit knowledge that resides in customers, and skilled personnel are effective sources for exploitation of international knowledge spillovers. Participation in seminars and conferences also enhances the acquisition of applied science. Firms that rely on codified sources are unlikely to acquire any knowledge. This research also confirms other authors’ findings that subsidiary autonomy facilitates knowledge acquisition. In addition, knowledge in product development is most likely to lead to vertical intra-firm transfers while applied scientific research only results in the transfer of R&D capability. Scientific team visits from the US to Japan support subsidiaries’ transfer of R&D capability but teams sent from Japan to the US adversely affect transfers. Overall, our results suggest international spillovers are predominantly associated with the acquisition of tacit knowledge, and intra-firm transfers are most effective in the context of knowledge acquired in applied research and product development.

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Ho, Yen-Chen. "Multilateral knowledge transfer and multiple embeddedness." Multinational Business Review 22, no. 2 (2014): 155–75. http://dx.doi.org/10.1108/mbr-04-2014-0010.

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Purpose – The purpose of this paper is to argue that multilateral knowledge transfer emerges from two lines of thinking in the international business (IB) literature – the exploitation of multinationality and the contributory role of subsidiaries – and links three levels of analysis – headquarters, knowledge-creating subsidiaries and host-country environments. Design/methodology/approach – Multilateral knowledge transfer, both vertical and horizontal, is considered in this paper as a cross-level phenomenon that emerges as a result of beneficial interdependencies between headquarters, knowledge-creating subsidiaries and their host-country environments. The paper also discusses the concept of embeddedness, which both lines of thinking draw upon, and argues that the multinational enterprise (MNE) headquarters can actually moderate both internal and external embeddedness through global strategy and organizational design. Findings – By putting forward an integrative cross-level interdependency framework that incorporates insights from the R&D internationalization literature and the subsidiary evolution literature, this paper delineates multilateral knowledge transfer as an MNE strategy to systematically transform and integrate knowledge created at the subsidiary-level for the global competitive advantage at the MNE group-level. Originality/value – Such a perspective reemphasizes the multi-level nature of IB studies and provides new opportunities for theoretical and empirical development as did the internalization theory which has theorized the conventional headquarters-to-subsidiaries knowledge transfer more than 40 years ago.

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Goh, Ai-Ting. "Knowledge diffusion, input supplier's technological effort and technology transfer via vertical relationships." Journal of International Economics 66, no. 2 (2005): 527–40. http://dx.doi.org/10.1016/j.jinteco.2004.06.010.

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Testa, Giovanna. "Knowledge transfer in vertical relationship: the case study of Val d'Agri oil district." Journal of Knowledge Management 17, no. 4 (2013): 617–36. http://dx.doi.org/10.1108/jkm-03-2013-0107.

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Ciabuschi, Francesco, Henrik Dellestrand, and Philip Kappen. "Exploring the Effects of Vertical and Lateral Mechanisms in International Knowledge Transfer Projects." Management International Review 51, no. 2 (2011): 129–55. http://dx.doi.org/10.1007/s11575-011-0068-1.

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Dissertations / Theses on the topic "Vertical knowledge transfer"

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Squire, Brian Christopher. "Knowledge transfer within vertical supplier relations : moderators and performance outcomes." Thesis, University of Bath, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420871.

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Duanmu, Jing-Lin. "Vertical knowledge transfer from multinational enterprises (MNEs) to Chinese supplier firms : an explorative study." Thesis, University of Bath, 2006. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512324.

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Sichinsambwe, Chanda M. "Effectiveness and Efficiency of Knowledge Transfer in Supplier Development: Key Antecedents and Buyer-Supplier Outcomes." Cleveland State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=csu1315200802.

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Yen, Chin-Fang, and 顏進芳. "Interorganizational knowledge transfer of vertical and horizontal collaboration in terms of context." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/18462142442865669482.

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碩士<br>東海大學<br>工業工程與經營資訊學系<br>93<br>It’s can be found from the evolution of industry’s history, ‘small and beautiful’ model has already replaced ‘great and the whole’ model for international operation gradually, become important developing direction that international enterprises management; and the division of labor network of the industry can be regarded as the important background that facilitate organizational knowledge formation and interorganizational knowledge transfer. On the other hand, the context also has strong influence on the generation of knowledge and interactive relationship of interorganization. Therefore, to sharp the proper context, in order to enable the conversion and transmission of knowledge, is crucial to succeed in the interorganization knowledge transfer. In this study, with the view of context, try to suggest an analysis framework and characteristics for interorganizational knowledge transfer. At first, propose two kinds of knowledge types in terms of division of labor of the industry, and then find out two different interactive relationship orientations according to the interorganizational interactive relationship, construct out of four kinds of knowledge transfer types: ‘the vertical task type’, ‘the horizontal task type’, ‘the horizontal partner type’ and ‘the vertical partner type’. To collocate knowledge conversion model with the context view, explore the processes of knowledge conversion of various kinds of knowledge transfer types further, contributing to grasping the key elements of influencing knowledge transfer by this, increasing the chance that organization succeed in finishing knowledge transfer. The result discussed from the case study can show, this analysis framework of knowledge transfer, not only provided the theoretical foundation with academy, but also quite worth for reference as to the enterprise in practice world.

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Book chapters on the topic "Vertical knowledge transfer"

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Rudy, Kathryn M. "Conclusion." In Touching Parchment: How Medieval Users Rubbed, Handled, and Kissed Their Manuscripts. Open Book Publishers, 2024. http://dx.doi.org/10.11647/obp.0379.06.

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The final chapter considers the social significance of book handling in medieval manuscripts, highlighting models of gesture transmission that fostered social bonds. These models include ritualistic actions required by religious scripts, behaviors modeled by authorities, and behaviors shaped by figures such as teachers. These are all vertical forms of behavior transmission. Horizontal forms include haptic habits that transfer across contexts (at a macro level), and members of peer groups who emulate each other’s behavior (at a micro level). Finally, some interactions are dictated by the physical demands of the book object itself. The study has emphasized the physicality of medieval book interaction, where filling in blanks or adding inscriptions was not just a clerical task but a socially binding act, connecting the past with the future through living continuity. The text investigates the ritualized nature of book handling, with authority figures modeling book interaction that trickled down through social hierarchies, becoming embedded in various rituals and thereby spreading to broader lay and religious communities. A manuscript's marks of wear provide historical evidence of its use, supporting the argument that certain gestures, like touching book initials, had social and performative roles, enhancing the experiential aspect of reading and group participation. The chapter posits that touching an initial could signify the initiation of reading, veneration, or a demonstration to an audience. It proposes that these gestures, while evolving over time and contexts, have left enduring marks on the physical and cultural fabric of book history. In the afterword, the author invites alternate interpretations and evidence, aiming to deepen the understanding of medieval manuscript reception and user interaction. The legacy of these book-touching behaviors persists in contemporary rituals, such as oath-taking, albeit with modern adaptations reflecting current societal norms and knowledge, such as hygiene concerns or secular values.

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Jaguli, Abd Rahim. "Channel for Vertical Spillovers." In Foreign Direct Investments. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2448-0.ch023.

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The objective of this study was to fill a research gap, where the channels through which technology and knowledge were transferred remained unexplored in the existing Foreign Direct Investment (FDI) knowledge transfer literature. A case study method was adopted as it is appropriate for exploring the complex process of knowledge transfer. The findings obtained from the case studies were able to demonstrate a positive relationship between MNCs and local innovation where knowledge and technology can be diffused through training programmes offered by MNCs to local suppliers. It provides an understanding as to the extent to which MNCs, through linkages with local firms, may facilitate the innovation activities of said local firms. Policy implications are subsequently discussed and future research suggestions are then put forth.

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Jaguli, Abd Rahim. "Channel for Vertical Spillovers." In Handbook of Research on Impacts of International Business and Political Affairs on the Global Economy. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9806-2.ch006.

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The objective of this study was to fill a research gap, where the channels through which technology and knowledge were transferred remained unexplored in the existing Foreign Direct Investment (FDI) knowledge transfer literature. A case study method was adopted as it is appropriate for exploring the complex process of knowledge transfer. The findings obtained from the case studies were able to demonstrate a positive relationship between MNCs and local innovation where knowledge and technology can be diffused through training programmes offered by MNCs to local suppliers. It provides an understanding as to the extent to which MNCs, through linkages with local firms, may facilitate the innovation activities of said local firms. Policy implications are subsequently discussed and future research suggestions are then put forth.

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Chan, Billy Chun Chuen. "SCAFFOLD FOR VERTICAL STUDIO: ACTIVITY, ARTEFACT, AND LEARNING TOOL." In Vertical _Studios VS_Montage, Scaffold Pedagogies as Knowledge Transfer. Hong Kong Polytechnic University, 2025. https://doi.org/10.31182/sdindex.ayua1385.

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Bruyns, Gerhard, and Daniel Elkin. "CUISINE TYPOLOGY AS (DATA) MONTAGES OF SOCIAL-SPATIAL SETTINGS." In Vertical _Studios VS_Montage, Scaffold Pedagogies as Knowledge Transfer. Hong Kong Polytechnic University, 2025. https://doi.org/10.31182/sdindex.kava7751.

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Louw, Mike, and Sally Farrah. "FOOD [FOR] THOUGHT: MOVEMENT, MEMORY, AND POST-COLONIAL FOOD SPACES." In Vertical _Studios VS_Montage, Scaffold Pedagogies as Knowledge Transfer. Hong Kong Polytechnic University, 2025. https://doi.org/10.31182/sdindex.eoum4628.

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Dalkir, Kimiz. "The Role of Human Resources (HR) in Tacit Knowledge Sharing." In Advances in Knowledge Acquisition, Transfer, and Management. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2394-9.ch014.

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In Knowledge Continuity Management (KCM), knowledge from highly experienced employees leaving the organization is particularly challenging to document, classify and organize so that it can be accessed, understood and used by the successor to that employee. Horizontal knowledge sharing (in the context of peer-to-peer networks) and vertical knowledge transfer (in the context of KCM) are distinguished in order to address some of the conceptual confusion in this field. Both Human Resources (HR) and Knowledge Management (KM) units contribute to KCM but they need to do so in a more integrated fashion. The complementary roles played by the KM and HR teams are analyzed in a case study to show how they can work in tandem to ensure knowledge continuity in an organization. Key recommendations are made on how to implement a comprehensive KCM strategy for tacit knowledge, including the role that can be played by information and communication technologies.

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Dalkir, Kimiz. "The Role of Human Resources (HR) in Tacit Knowledge Sharing." In Information Diffusion Management and Knowledge Sharing. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0417-8.ch024.

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In Knowledge Continuity Management (KCM), knowledge from highly experienced employees leaving the organization is particularly challenging to document, classify and organize so that it can be accessed, understood and used by the successor to that employee. Horizontal knowledge sharing (in the context of peer-to-peer networks) and vertical knowledge transfer (in the context of KCM) are distinguished in order to address some of the conceptual confusion in this field. Both Human Resources (HR) and Knowledge Management (KM) units contribute to KCM but they need to do so in a more integrated fashion. The complementary roles played by the KM and HR teams are analyzed in a case study to show how they can work in tandem to ensure knowledge continuity in an organization. Key recommendations are made on how to implement a comprehensive KCM strategy for tacit knowledge, including the role that can be played by information and communication technologies.

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Reimers, Clare E., Richard A. Jahnke, and Laurenz Thomsen. "In Situ Sampling in the Benthic Boundary Layer." In The Benthic Boundary Layer. Oxford University PressNew York, NY, 2001. http://dx.doi.org/10.1093/oso/9780195118810.003.0010.

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Abstract The objective of most in situ benthic boundary layer (BBL) measurements is to quantify the transport of mass, either across or along the sediment-water interface, while also gaining knowledge of the roles played by specific processes in determining transfer rates. Studies can be separated into sediment transport investigations that focus on suspended sediment dynamics, and solute transport studies that focus on the workings of early diagenesis. A third and related category of study concerns the vertical structure of velocity in the boundary layer. Inasmuch as critical length and time scales, mechanisms of transport, and biological components vary greatly among different benthic environments, instrument packages and deployment vehicles of varying designs and degrees of complexity have been developed to make bottom boundary layer measurements. This chapter aims to (1) describe the general principles of several of the most common methodologies that are applied in situ to measure BBL mass transport and examples of instruments that implement these methodologies, (2) discuss a few specific limitations of these techniques and circumstances when these limits matter and when they do not, and (3) raise some unanswered questions concerning shallow and deep-sea BBLs that are revealed by new data sets collected with emerging in situ approaches.

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Lincoln, James R., and Christina Ahmadjian. "Shukko (Employee Transfers) and Tacit Knowledge Exchange in Japanese Supply Networks: The Electronics Industry Case." In Knowledge Emergence. Oxford University PressNew York, NY, 2001. http://dx.doi.org/10.1093/oso/9780195130638.003.0013.

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Abstract How Japanese companies manage purchase-supply relations has drawn consider- able attention from scholars and practitioners. Indeed, the Japanese approach to supply chain management is now worldwide “best practice” in the automobile industry and in other strategic industrial sectors (Mitchener and Steinmetz, 1998). Close and long-term relations; high trust and mutual disclosure of information; and cospecialized investment in knowledge and other assets together comprise a supply management regime that has been much admired and copied (Womack, Jones, and Roos, 1990). In its ideal form, the Japanese model averts the Scylla of low-trust contracting and the Charybdis of full vertical integration under a corporate chain of command. Outcomes include: more and earlier supplier participation in customer designs; higher quality components; higher reliability of deliveries; and so on.

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Conference papers on the topic "Vertical knowledge transfer"

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Suimon, Takumi, Yuki Koizumi, Junji Takemasa, and Toru Hasegawa. "A Data Reconstruction Attack Against Vertical Federated Learning Based on Knowledge Transfer." In IEEE INFOCOM 2024 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS). IEEE, 2024. http://dx.doi.org/10.1109/infocomwkshps61880.2024.10620788.

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Panduranga, Kottala, and Santanu Koley. "Attenuation of oblique waves by vertical slatted porous screens." In DIDACTIC TRANSFER OF PHYSICS KNOWLEDGE THROUGH DISTANCE EDUCATION: DIDFYZ 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0080588.

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Huang, Chung-ju, Leye Wang, and Xiao Han. "Vertical Federated Knowledge Transfer via Representation Distillation for Healthcare Collaboration Networks." In WWW '23: The ACM Web Conference 2023. ACM, 2023. http://dx.doi.org/10.1145/3543507.3583874.

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Saemi, Farid, and Moble Benedict. "A Semi-empirical Method to Predict Motor Heat Transfer Coefficient for SUAS Conceptual Design." In Vertical Flight Society 78th Annual Forum & Technology Display. The Vertical Flight Society, 2022. http://dx.doi.org/10.4050/f-0078-2022-17607.

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The brushless DC motors of small unmanned aerial systems typically rely on axial air-cooling. Modeling the motor's thermal dynamics requires knowledge of the convective heat transfer coefficient. However, the coefficient is an extrinsic property which depends on surrounding conditions. As such, motor manufacturers provide no relevant data which stymies conceptual design and modeling. This paper presents an analytical method to predict the motor's heat transfer coefficient in various operating conditions using readily-available parameters. The paper also shares experimental measurements of heat transfer coefficient collected on a custom-instrumented hover stand. The analytical predictions matched experimental trends for a range of operating shaft speeds. The experimental measurements indicate that the heat transfer coefficient increases with shaft speed before reaching a maximum. The combined results provide guidance for eVTOL conceptual designers in (1) predicting a motor system's steady-state temperature, (2) maximizing convective cooling, and (3) understanding tradeoffs for compact and thermally-conductive motors.

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Vagts, Steffen, and Josef Schlattmann. "General Systems Theory in a Horizontal and Vertical Action Process for Cross-Disciplinary Knowledge Transfer." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64235.

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Biomimetic product development builds a bridge between the scientific disciplines engineering and biology and represents a cross-disciplinary knowledge circulation, which can produce highly innovative advancements in technology. The methodological support for such projects was initiated by the VDI guideline 6220 by 2012 [1] and still requires further research. The method presented in this abstract tries to provide a significant contribution to the successful transfer of knowledge across disciplines, to convey innovative solutions from biology to technology. The central idea of the method called Heli-Act (an acronym of Helix and Action) described here is based on the system-theoretical analysis of the action and the action carrier, the action circle and the action line under the relevant aspects of the socio-technical integration of methods and tools that will support the action carrier in the biomimetic development process. As a cross-common “language” general systems theory is used, which also includes the mathematical modeling system for both action as well as for object systems, which allows a computer-assisted method implementation. For the association of specialized terminology of the disciplines involved in the cross-disciplinary communication a semantic network is used to derive a translation tool in the Ontology World Language (OWL). Practical application experiences from a current project are presented, which describes the tribological optimization of a technical joint by awareness from the analysis of insects joints.

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Kavalci, Mehmet, Mark Wspanialy, Laura Heyns, Marcus Cornelius, and Igor Pioro. "Heat Transfer to Supercritical Water Flowing in Short Vertical Bare Tubes." In 2024 31st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/icone31-135875.

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Abstract It is well known that water-cooled nuclear-power reactors / Nuclear Power Plants (NPPs) equipped with light- and heavy-water-cooled reactors have relatively low thermal efficiencies within the range of 26–38% compared to those of thermal power plants – combined-cycle up to 62.5% and supercritical-pressure Rankine cycle up to 55%. Therefore, increasing thermal efficiency of next generation NPPs / nuclear reactors is a very important task. For water-cooled reactors / NPPs the conventional approach for increasing thermal efficiency is to move to supercritical pressures, as it was done more than 60 years ago in the thermal-power industry. Currently, together with large-capacity SuperCritical Water-cooled Reactors (SCWRs) SC-Pressure Small Modular Reactors (SCP SMRs) are also being developed. Therefore, solid knowledge of heat-transfer specifics at supercritical pressures is required. Usually, hydraulic-equivalent diameters of modern bundle flow geometries are within 5–10 mm and heated lengths are up to 4 m for SCWRs and can be shorter for SCP SMRs. Also, first SCWRs as test, experimental, or pilot reactors will be with relatively small installed capacities within 100–300 MWel. Due to that it is important to investigate supercritical heat transfer in small diameters tubes as a first and preliminary step instead of bundle geometries and bundle simulators. Usually, heat transfer in bare tubes is considered as the conservative approach compared to bundle tests, because heat transfer in bundle geometries will be higher compared to that in bare tubes due to additional turbulization from various appendages inside sub-channels. The paper presents experimental data obtained in relatively short vertical bare tubes mainly with upward flow of SCW. The experiments have been performed by Dr. V. Razumovskiy1 at the National Technical University of Ukraine. The data were obtained at the pressure of 23.5 MPa, mass fluxes of 2193 kg/m2s (main set of data) and 509 and 248 kg/m2s, and heat fluxes within 104–2660 kW/m2. The experimental data were compared to a well-known subcritical-pressure heat-transfer correlation developed by Dittus and Boelter. The heat-transfer-coefficient data were predicted quite reasonably with this correlation within the normal heat-transfer regime, but were significantly higher those within the deteriorated heat-transfer regime and within the pseudocritical region.

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Gupta, Sahil, Donald McGillivray, Prabu Surendran, Liliana Trevani, and Igor Pioro. "Developing Heat-Transfer Correlations for Supercritical CO2 Flowing in Vertical Bare Tubes." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54626.

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This paper presents an analysis of three new heat-transfer correlations developed for supercritical carbon dioxide (CO2) flowing in vertical bare tubes. A large set of experimental data was obtained at Chalk River Laboratories (CRL) AECL. Heat-transfer tests were performed in upward flow of CO2 inside 8-mm ID vertical Inconel-600 tube with a 2.208-m heated length. Data points were collected at outlet pressures ranging from 7.4 to 8.8 MPa, mass fluxes from 900 to 3000 kg/m2s, inlet fluid temperatures from 20 to 40°C, and heat fluxes from 15 to 615 kW/m2; and for several combinations of wall and bulk-fluid temperatures that were below, at, or above the pseudocritical temperature. The objective of the present experimental research is to obtain reference dataset on heat transfer in supercritical CO2 and improve our fundamental knowledge of the heat-transfer processes and handling of supercritical fluids. In general, heat-transfer process to a supercritical fluid is difficult to model, especially, when a fluid passes through the pseudocritical region, as there are very rapid variations in thermophysical properties of the fluid. Thus, it is important to investigate supercritical-fluid behaviour within these conditions. In general, supercritical carbon dioxide was and is used as a modelling fluid instead of supercritical water due to its lower critical parameters compared to those of water. Also, supercritical carbon dioxide is proposed to be used as a working fluid in the Brayton gas-turbine cycle as a secondary power cycle for some of the Generation-IV nuclear-reactor concepts such as a Sodium-cooled Fast Reactor (SFR), Lead-cooled Fast Reactor (LFR) and Molten-Salt-cooled Reactor (MSR). In addition, supercritical carbon dioxide was proposed to be used in advanced air-conditioning and geothermal systems. Previous studies have shown that existing correlations deviate significantly from experimental Heat Transfer Coefficient (HTC) values, especially, within the pseudocritical range. Moreover, the majority of correlations were mainly developed for supercritical water, and our latest results indicate that they cannot be directly applied to supercritical CO2 with the same accuracy as for water. Therefore, new empirical correlations to predict HTC values were developed based on the supercritical CO2 dataset. These correlations calculate HTC values with an accuracy of ±30% (wall temperatures with accuracy of ±20%) for the analyzed dataset.

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Shuai, Jianyun, Rudi Kulenovic, and Manfred Groll. "Heat Transfer and Pressure Drop for Flow Boiling of Water in Narrow Vertical Rectangular Channels." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1084.

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Flow boiling in small-sized channels attracted extensive investigations in the past two decades due to special requirements for transfer of high heat fluxes from narrow spaces in various industrial applications. Experiments on various aspects of flow boiling in narrow channels were carried out and theoretical attempts were undertaken. But these investigations showed large differences, e.g. up till now the knowledge on the development of flow patterns in small non-circular flow passages is very limited. This paper deals with investigations on flow boiling of water in two rectangular channels with dimensions (width×depth) 2.0×4.0 mm2 and 0.5×2.0 mm2 (corresponding hydraulic diameters are 2.67 mm and 0.8 mm). The pressure at the test section exit is atmospheric. For steady-state experimental conditions the effects of heat flux, mass flux and inlet subcooling on the boiling heat transfer coefficient and the pressure drop are investigated. Flow patterns and the transition of flow patterns along the channel axis are visualized and documented with a video-camera. Bubbly flow, slug flow and annular flow are distinguished in both channels. Preliminary flow pattern maps are generated.

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Mohammadi, K., W. Heidemann, and H. Mu¨ller-Steinhagen. "Semi-Analytical Calculation of the Inlet Zone Performance of Ideal Shell and Tube Heat Exchangers." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22276.

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A semi-analytical model is presented for the evaluation of the performance factor of the inlet zone of an E type shell and tube heat exchanger without leakage flows. The performance factor is defined as the ratio of dimensionless heat transfer coefficients and pressure drops of both vertical and horizontal baffle orientation and therefore facilitates the decision between horizontal and vertical baffle orientation of shell and tube heat exchangers. The model allows the calculation of the performance factor of the inlet zone as a function of the baffle cut, the shell-side Reynolds number at the inlet nozzle and the Prandtl number of the shell-side fluid. The application of the model requires the knowledge of the performance factor of water at baffle cut equal to 24% of the shell inside diameter. For the development of the model a numerical data basis is used due to the lack of experimental data for shell and tube heat exchangers with different baffle orientations. The numerical data are obtained from CFD calculations for steady state conditions within a segmentally baffled shell and tube heat exchanger following the TEMA standards. Air, water and engine oil with Prandtl numbers in the range of 0.7 to 206 are used as shell-side fluids. The semi-analytical model introduced for the performance factor predicts the CFD results with a relative absolute error less than 5%. The presented model has to be validated with further experimental data and/or numerical results which explain the effect of baffle orientation on the shell-side heat transfer coefficient and pressure drop in order to check the general applicability.

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Yang, Dong, Qixian Wu, Lin Chen, and Igor Pioro. "Numerical Investigation on Heat Transfer to Supercritical Water Flowing Upward in a 4-M Long Bare Vertical Circular Tube." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16456.

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Abstract Thermal efficiency and safety of Generation-IV nuclear-power-reactor concept - Supercritical Water-cooled Reactor (SCWR) depend on solid knowledge of specifics of SCW thermophysical properties and heat transfer within these conditions. As a preliminary, but conservative approach to uncover these specifics is analysis of experimental data obtained in bare tubes including numerical investigation. This paper presents the numerical investigation, based on computational fluid dynamics, of the heat-transfer characteristics of SCW flow in a 4-m long circular tube (ID = 10 mm). The flow and heat-transfer mechanism of SCW in the vertical tube under the influence of buoyancy and flow acceleration are analyzed. Results of numerical simulation predict the experimental data with reasonable accuracy. The results indicated that in the region of q/G &gt; 0.4 kJ/kg, the wall temperature distribution tends to be non-linear, and heat transfer may deteriorate. When Tb &lt; Tpc &lt; Tw, internal wall temperature shows peaks, which corresponds to heat-transfer deterioration. Meanwhile the position, where the deterioration occurs is continuously moved forward to the inlet as the heat flux increases. Velocity changes near the wall show an M shape according to mass conservation for the density change.

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