Thermohydraulics of the liquid films in rotating heat pipes

2019 ◽  
Vol 30 (6) ◽  
pp. 2861-2866 ◽  
Author(s):  
Kamel Hooman ◽  
Mohammad Reza Safaei ◽  
Hussein Togun ◽  
Mahidzal Dahari
Keyword(s):  
Film Thickness ◽  
Heat Pipe ◽  
Flow Rate ◽  
Design Methodology ◽  
Heat Pipes ◽  
Liquid Films ◽  
Practical Application ◽  
Content Type ◽  
Closed Form Solutions ◽  
Good Agreement

Purpose In this study, closed-form solutions are presented to investigate thermohydraulics of liquid films in a rotating heat pipe. The film thickness is expressed as a function of flow rate. Design/methodology/approach Further, sensitivity of both film thickness and flow rate to the length of the rotating heat pipe can now be investigated using the explicit expressions presented here. Findings To make it easier for practical application, an approximate solution is presented on top of the exact solution. Originality/value Both approximate and exact solutions are then applied to note that results are in good agreement when compared to those available in the literature.

Improving the tie force method for progressive collapse design of RC frames

2018 ◽  
Vol 9 (4) ◽  
pp. 520-531 ◽  
Author(s):  
Arash Naji
Keyword(s):  
Design Methodology ◽  
Progressive Collapse ◽  
Limit State ◽  
Content Type ◽  
Catenary Action ◽  
Closed Form Solutions ◽  
Rc Frames ◽  
Orthogonal Beams ◽  
Similar Equation ◽  
Good Agreement

Purpose The purpose of this paper is to recover the deficiency of existing tie force (TF) methods by considering the decrease in section strength due to cracking and by selecting limit state of collapse according to section properties. Design/methodology/approach A substructure is selected by isolating the connected beams from the entire structure. For interior joints, the TFs in the orthogonal beams are obtained by catenary action. For corner joints, the TFs are assessed by beam action. For edge joints, however, the resistance is gained by greater of the resistance under catenary action for periphery beams and beam action for all the connecting beams in both directions. For catenary action, the TF capacities must satisfy Equation (20). On the other hand, for beam action, the TF must satisfy Equation (16), while R is calculated from Equation (17). In the case where the length of the connecting beams is similar, Equation (19) can be used. Findings Closed form solutions are available for TFs on both beam and catenary stages. Originality/value The proposed formulation makes designing more practical and convenient. However, the proposed formulation had good agreement with experimental results.

The 4Cs of mass customization in service industries: a customer lens

2020 ◽  
Vol 34 (4) ◽  
pp. 499-511 ◽  
Author(s):  
Jessica L. Pallant ◽  
Sean Sands ◽  
Ingo Oswald Karpen
Keyword(s):  
Boundary Conditions ◽  
Mass Customization ◽  
Design Methodology ◽  
Service Industries ◽  
Future Research ◽  
Practical Application ◽  
Theoretical Understanding ◽  
Content Type ◽  
Priority Areas ◽  
Research Priority

Purpose Increasingly, customers are demanding products that fit their individual needs. Many firms respond by cultivating product individualization via mass customization, often integrating this capability via interactive platforms that connect them with customers. Despite such customization, research to date has lacked cohesion, often taking the organizational, rather than customer, view. The purpose of this paper is to provide inconclusive theorizing in regard to customization from the consumers’ perspective. Design/methodology/approach The review and synthesis of the literature revealed that co-configuration is an underexplored domain of mass customization. Consequently, an initial conceptualization of co-configuration is developed and compared with current customization strategies. Specifically, the definition and boundary conditions of co-configuration are compared with three domains of mass customization, namely, co-production, co-construction and co-design. This led to the development of research priority areas to establish an agenda for future research on mass customization and its role in customer’ firm relationships. Findings This paper provides the delineation of four distinct consumer customization strategies, conceptualized in a matrix, and proposes separate customer journey visualizations. In advancing the theoretical understanding by means of a unifying typology, this paper identifies three existing Cs of mass customization (co-production, co-construction and co-design) and focuses specifically on a fourth (co-configuration), identified as an understudied mass customization strategy. Originality/value This paper extends the previous conceptualizations of mass customization comprising co-production, co-design and co-construction. The proposed typology establishes a foundation for four research priority areas that can improve both academic rigor and practical application.

Improvement of plating uniformity for copper patterns of IC substrate with multi-physics coupling simulation

Circuit World ◽  
2018 ◽  
Vol 44 (3) ◽  
pp. 150-160 ◽  
Author(s):  
Jing Xiang ◽  
Yuanming Chen ◽  
Shouxu Wang ◽  
Chong Wang ◽  
Wei He ◽  
...  
Keyword(s):  
Numerical Model ◽  
Current Distribution ◽  
Design Methodology ◽  
Thickness Distribution ◽  
Practical Application ◽  
Pattern Design ◽  
Environment Friendly ◽  
Content Type ◽  
Varied Pattern ◽  
Multiphysics Coupling

Purpose Optimized plating conditions, included proper designs of insulating shield (IS), auxiliary cathode (AC) and different patterns, contribute to the uniformity enhancement of copper deposition. Design/methodology/approach Plating experiments were implemented in vertical continuous plating (VCP) line for manufacturing in different conditions. Multiphysics coupling simulation was brought to investigate and predict the plating uniformity improvement of copper pattern. In addition, the numerical model was based on VCP to approach the practical application. Findings With disproportionate current distribution, different plating pattern design formed diverse copper thickness distribution (CTD). IS and AC improved plating uniformity of copper pattern because of current redistribution. Moreover, optimized plating condition for effectively depositing more uniformed plating copper layer in varied pattern designs were derived by simulation and verified by plating experiment. Originality/value The comparison between experiment and simulation revealed that multiphysics coupling is an efficient, reliable and of course environment-friendly tool to perform research on the uniformity of pattern plating in manufacturing.

Effect of torque ratio on speed regulating start

2018 ◽  
Vol 70 (9) ◽  
pp. 1657-1663
Author(s):  
Qingrui Meng ◽  
Zhao Chenghao ◽  
Tian Zuzhi
Keyword(s):  
Film Thickness ◽  
Theoretical Basis ◽  
Design Methodology ◽  
Load Capacity ◽  
Load Torque ◽  
Content Type ◽  
Oil Film ◽  
Torque Transmission ◽  
Drive Speed ◽  
Starting Process

Purpose Friction pairs of the hydro-viscous drive speed regulating start device should be designed based on the rated torque. To obtain design basis of the rated torque of the hydro-viscous drive speed regulating start device, studies on effect of torque ratio (a ratio of the load torque to the rated torque) on speed regulating start were carried out theoretically and experimentally. Design/methodology/approach Under different torque ratio, the modified Reynolds, the thermal energy and the viscosity-temperature equations were solved simultaneously by using finite element method to reveal variation laws of the oil film load capacity and torque transmission during the starting process. Then, speed regulating start experiments were carried out to study the following performance of the output speed. Findings The results show that oil film thickness decreases with the increase of the torque ratio; when oil film thickness is less than 0.05 mm, oil film temperature increases rapidly with the decrease of oil film thickness, which eventually deteriorates performance of the speed regulating start; when the torque ratio decreases to about 0.3, output speed shows a better following performance. Originality/value It indicates that, to acquire a better speed regulating start, the rated torque of the hydro-viscous drive speed regulating start device should not be less than three times of the load torque. Achievements of this work provide theoretical basis for optimal design of the friction pairs of the hydro-viscous drive speed regulating start device.

Measuring customer value co-creation behavior

2017 ◽  
Vol 27 (5) ◽  
pp. 930-950 ◽  
Author(s):  
Aurelio Tommasetti ◽  
Orlando Troisi ◽  
Massimiliano Vesci
Keyword(s):  
Conceptual Model ◽  
Customer Value ◽  
Design Methodology ◽  
Future Research ◽  
Practical Application ◽  
Content Type ◽  
Dominant Logic ◽  
Measurement Framework ◽  
Information Research ◽  
Comprehensive Framework

Purpose In line with the precepts of service-dominant logic (SDL), the purpose of this paper is to devise a measurement framework of customer value co-creation practices during the service process. Design/methodology/approach Answering the call of McColl-Kennedy et al. (2012), the present study develops a general conceptual model for the measurement of customer value co-creation behavior, in line with the procedure elaborated by Churchill (1979). In particular, the paper focuses on the first stage of the protocol, corresponding to the specification of the domain of the construct. Findings The study shows that the scale for measuring behavioral processes in customer value co-creation has an implicit hierarchical structure based on eight activities to ensure adequate semantic coverage of the concept: cerebral activities, cooperation, information research and collation, the combination of complementary activities, changes in habits, co-production, co-learning, and connection. Moreover, the work highlights that the analysis of customer value co-creation behavior leads to three diverse steps of value co-creation and various levels of interaction. Originality/value By systematizing the construct of customer value co-creation behavior within a comprehensive framework, the conceptual model attempts to fill a gap evidenced by previous research in order to show that actions performed by users during the value co-creation process strictly conform to SDL assumptions. Moreover, the framework underpinning the practical application of SDL principles could benefit future practitioners and suggest interesting implications for future research.

Design and practicability evaluation: a novel platform for fabric steam ironing

2016 ◽  
Vol 28 (4) ◽  
pp. 449-462 ◽  
Author(s):  
Shuaitong Liang ◽  
Xue Mei Ding ◽  
Xiong Ying Wu ◽  
Fan Wu ◽  
Tesfaye Mulu Asmamaw
Keyword(s):  
Level Set ◽  
Flow Rate ◽  
Design Of Experiment ◽  
Design Methodology ◽  
Low Cost ◽  
New Products ◽  
Steam Flow ◽  
Content Type ◽  
Test Platform ◽  
Fabric Materials

Purpose – Smooth appearance of fabrics after ironing with steam, soleplate, ironing speed and their interactions cannot be studied using household ironing machines such as hang steamer and flatiron. The purpose of this paper is to present the design and verification of a simple, low-cost test platform based on the fabric materials hang-ironing factors includes temperature, humidity, ironing speed (time). Design/methodology/approach – This platform achieves adjustable and stable steam flow rate, enabling any ironing speed and any temperature of soleplate below 200°C. Moreover, the whole ironing process is automatically after experiment level set ahead for better observation to the ironing process. Findings – Regression results of the apparatus are stable, statistical significant which is verified by the statistics under design of experiment. Originality/value – It is useful in other aspects such as nozzle test and improvement, new products evaluation and smooth appearance level experiment and test for new ironing product and its research. It is also useful in other aspects such as nozzle test and improvement, new products evaluation and smooth appearance level experiment and test for new ironing product and its research.

The estimation of the length constant of a long cooling fin by variational iteration method

2015 ◽  
Vol 25 (4) ◽  
pp. 887-891 ◽  
Author(s):  
Yan Zhang ◽  
Qiaoling Chen ◽  
Fujuan Liu ◽  
Ping Wang
Keyword(s):  
Nonlinear Equation ◽  
Nonlinear Equations ◽  
Iteration Method ◽  
Design Methodology ◽  
Variational Iteration Method ◽  
Engineering Problem ◽  
Content Type ◽  
Variational Iteration ◽  
Length Constant ◽  
Good Agreement

Purpose – The purpose of this paper is to validate the variational iteration method (VIM) is suitable for various nonlinear equations. Design/methodology/approach – The He’s VIM is applied to solve nonlinear equation which is derived from actual engineering problem. The result was compared with other method. Findings – The result obtained from VIM shows good agreement with Xu’s result which provide a solid evidence that VIM is convenient and effective for solving nonlinear equation in the engineering. Originality/value – The VIM can be extended to many academic and engineering fields for nonlinear equations solving.

Executive options with inflated equity prices

2014 ◽  
Vol 10 (3) ◽  
pp. 266-292 ◽  
Author(s):  
Linus Wilson ◽  
Yan Wendy Wu
Keyword(s):  
Boards Of Directors ◽  
Stock Price ◽  
Design Methodology ◽  
Ceo Compensation ◽  
Managerial Compensation ◽  
Equity Prices ◽  
Content Type ◽  
Closed Form Solutions ◽  
Compensation Package ◽  
Applied Game Theory

Purpose – The purpose of this paper is to solve the optimal managerial compensation problem when shareholders are either naïvely optimistic or rational. Design/methodology/approach – The paper uses applied game theory to derive the optimal CEO compensation package with over optimistic shareholders. Findings – The results suggest that boards of directors should decrease option grants to CEOs when equity is likely to be irrationally overvalued at the date when the CEO's options vest. Research limitations/implications – The implications of the model are consistent with the available empirical evidence. In addition, the model generates new testable predictions about managerial stock price manipulation, the number of options granted, and the magnitude of the options’ strike prices that have not yet been formally tested. Originality/value – This is the only paper to derive closed-form solutions to optimal CEO compensation when shareholders are naïvely optimistic.

Valuation paradigm: a rationality and (un)certainty spectrum

2017 ◽  
Vol 35 (2) ◽  
pp. 228-239 ◽  
Author(s):  
David Jansen van Vuuren
Keyword(s):  
Real Estate ◽  
Design Methodology ◽  
Confidence Score ◽  
Valuation Theory ◽  
Practical Application ◽  
End User ◽  
Risk And Uncertainty ◽  
Content Type ◽  
Secondary Purpose ◽  
Practical Implications

Purpose The purpose of this paper is threefold: the primary purpose is to suggest a real estate paradigm spectrum to act as reference for the contextualisation of observed market phenomenon in system terms; the secondary purpose is for the spectrum to contextualise the efficacy of real estate and valuation theory, methods and techniques; and the tertiary purpose is to propose a confidence score for reporting uncertainty to the end user of a valuation report. Design/methodology/approach Literature was reviewed on the concepts of risk and uncertainty, rationality and several systems thinking domains. Findings The framework can provide context to observed market phenomenon and distinguishes between agency and mechanism in contributing to conditions of certainty and uncertainty. The argument followed in this paper is that it is necessary to contextualise the efficacy of real estate and valuation theory, methods and models under conditions of certainty, normal uncertainty and abnormal uncertainty. The characteristics of conditions can be used as basis to develop new theory and practical application or modify existing. Practical implications Real estate economic theory can be organised in terms of the spectrum and the framework can potentially identify where further research is required and the requirements it must meet as measured against the characteristics of the framework. Current valuation methods and models can continue to be used when valuing under conditions of certainty, however, modifications to methods and models are required to account for complexity when valuing under conditions of normal uncertainty and abnormal uncertainty. The confidence score included in this paper can also be used to report the conditions of certainty/uncertainty under which the valuation was performed. Originality/value This paper aims to set the basis for new theoretical and practical developments of insights into real estate economic and valuation theory, methods and models while also contributing to the reporting of uncertainty through the proposed confidence score.

General inverse solution of six-degrees-of-freedom serial robots based on the product of exponentials model

2018 ◽  
Vol 38 (3) ◽  
pp. 361-367 ◽  
Author(s):  
Haixia Wang ◽  
Xiao Lu ◽  
Wei Cui ◽  
Zhiguo Zhang ◽  
Yuxia Li ◽  
...  
Keyword(s):  
Design Methodology ◽  
Degrees Of Freedom ◽  
Screw Theory ◽  
Complex Problem ◽  
Content Type ◽  
Geometrical Properties ◽  
Closed Form Solutions ◽  
Six Degrees Of Freedom ◽  
Serial Robots ◽  
Six Dof

Purpose Developing general closed-form solutions for six-degrees-of-freedom (DOF) serial robots is a significant challenge. This paper thus aims to present a general solution for six-DOF robots based on the product of exponentials model, which adapts to a class of robots satisfying the Pieper criterion with two parallel or intersecting axes among its first three axes. Design/methodology/approach The proposed solution can be represented as uniform expressions by using geometrical properties and a modified Paden–Kahan sub-problem, which mainly adopts the screw theory. Findings A simulation and experiments validated the correctness and effectiveness of the proposed method (general resolution for six-DOF robots based on the product of exponentials model). Originality/value The Rodrigues rotation formula is additionally used to turn the complex problem into a solvable trigonometric function and uniformly express six solutions using two formulas.

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