This paper presents an experimental investigation of the vorticity shedding and the susceptibility of acoustic resonance excitation for a square tube array with an intermediate tube spacing (i.e pitch-to-diameter ratio (P/D) of 1.73). The tube array could be rotated about an axis normal to the flow direction so that the effect of the flow approach angle could be investigated. Various Strouhal periodicities (St) were detected, and their strength, and value were dependant on the position measured within the tube bundle and the tube bundle's angular orientation. However, not all of the Strouhal periodicities measured caused self-excitation of acoustic resonance. This work illustrates the importance of considering the flow approach angle in the heat exchanger design phase to avoid the undesirable effects of acoustic resonance excitation during operation.
{"title":"Vorticity Shedding and Acoustic Resonance Excitation of a Square Tube Array: Effect of Flow Approach Angle","authors":"A. Mohany, M. Alziadeh, Marwan Hassan","doi":"10.1115/1.4055158","DOIUrl":"https://doi.org/10.1115/1.4055158","url":null,"abstract":"This paper presents an experimental investigation of the vorticity shedding and the susceptibility of acoustic resonance excitation for a square tube array with an intermediate tube spacing (i.e pitch-to-diameter ratio (P/D) of 1.73). The tube array could be rotated about an axis normal to the flow direction so that the effect of the flow approach angle could be investigated. Various Strouhal periodicities (St) were detected, and their strength, and value were dependant on the position measured within the tube bundle and the tube bundle's angular orientation. However, not all of the Strouhal periodicities measured caused self-excitation of acoustic resonance. This work illustrates the importance of considering the flow approach angle in the heat exchanger design phase to avoid the undesirable effects of acoustic resonance excitation during operation.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44621220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study dealt with the capacity of the inline technique to upgrade steel-pipe -based hydraulic systems with respect to magnitude attenuation and pressure-wave oscillation period expansion. This technique consisted in replacing a short-section of the induced transient pressure region with another of plastic material type, including High- or Low-Density PolyEthylene (HDPE or LDPE). The Method Of Characteristics was implemented to discretize the Extended One-Dimensional Water-Hammer Equations, embedding the Ramos et al. formulation. The comparison of the numerical solution with the observed data, quoted in the literature, and alternative numerical solution demonstrated the accuracy of the developed solver. The test case addressed a transient flow involving the cavitation onset. Results showed that the HDPE plastic-short-section -based layout of the inline technique provided the best tradeoff between magnitude attenuation and pressure-wave oscillation period expansion, in comparison with the LDPE plastic-short-section -based layout and the HDPE or LDPE material -based main-pipe systems.
{"title":"Removal of Cavitation Using HDPE/LDPE Inline Section-Pipe","authors":"M. Fersi, A. Triki","doi":"10.1115/1.4055155","DOIUrl":"https://doi.org/10.1115/1.4055155","url":null,"abstract":"\u0000 This study dealt with the capacity of the inline technique to upgrade steel-pipe -based hydraulic systems with respect to magnitude attenuation and pressure-wave oscillation period expansion. This technique consisted in replacing a short-section of the induced transient pressure region with another of plastic material type, including High- or Low-Density PolyEthylene (HDPE or LDPE). The Method Of Characteristics was implemented to discretize the Extended One-Dimensional Water-Hammer Equations, embedding the Ramos et al. formulation. The comparison of the numerical solution with the observed data, quoted in the literature, and alternative numerical solution demonstrated the accuracy of the developed solver. The test case addressed a transient flow involving the cavitation onset. Results showed that the HDPE plastic-short-section -based layout of the inline technique provided the best tradeoff between magnitude attenuation and pressure-wave oscillation period expansion, in comparison with the LDPE plastic-short-section -based layout and the HDPE or LDPE material -based main-pipe systems.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45796509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adriano Gomes de Freitas, Vitor Furlan Oliveira, Ricardo Borges dos Santos, L. Riascos, Ruiping Zou
Pneumatic conveying of powders is a unit process extensively used in industries for the handling of particulate material of several segments. Academic studies started with empirical dilute-phase pneumatic conveying and, in order to produce better economic results in industrial settings, evolved to include energy efficiency techniques as a significant component. Much work has been done to understand and model pneumatic conveying systems; however, they are highly empirical and the conclusions are, in most cases, limited to a narrow range of experimental conditions. This paper introduces a systematic method to select the air pressure and flow necessary to operate an energy-optimized pneumatic conveying system. This method has been tested and applied to a pressure conveyor fed by a compact blow tank of 100 L in a 133 m long pipeline with a diameter of 3 inches conveying limestone. The tests demonstrated that it is possible to control this pneumatic conveying system with only two input parameters, while operating at the desired pressure and airflow and maintaining the respective conveying rate and power requirements.
{"title":"Optimization Method for Pneumatic Conveying Parameters and Energy Consumption Performance Analysis of a Compact Blow Tank","authors":"Adriano Gomes de Freitas, Vitor Furlan Oliveira, Ricardo Borges dos Santos, L. Riascos, Ruiping Zou","doi":"10.1115/1.4055111","DOIUrl":"https://doi.org/10.1115/1.4055111","url":null,"abstract":"\u0000 Pneumatic conveying of powders is a unit process extensively used in industries for the handling of particulate material of several segments. Academic studies started with empirical dilute-phase pneumatic conveying and, in order to produce better economic results in industrial settings, evolved to include energy efficiency techniques as a significant component. Much work has been done to understand and model pneumatic conveying systems; however, they are highly empirical and the conclusions are, in most cases, limited to a narrow range of experimental conditions. This paper introduces a systematic method to select the air pressure and flow necessary to operate an energy-optimized pneumatic conveying system. This method has been tested and applied to a pressure conveyor fed by a compact blow tank of 100 L in a 133 m long pipeline with a diameter of 3 inches conveying limestone. The tests demonstrated that it is possible to control this pneumatic conveying system with only two input parameters, while operating at the desired pressure and airflow and maintaining the respective conveying rate and power requirements.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46304276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiang-hai Wu, Hongzhen Zhu, Yu-dong Sun, Mingzhu Su, Z. Yin
In this paper, torsional vibration band gap properties of fluid filled pipe were studied by using the transfer matrix method (TMM). Compared with the results carried by FEM software, the established torsional dynamic model and proposed method were verified. The effects of pipe wall`s material and parameters of support on the torsional vibration band gap properties were analyzed. Furthermore, the relationship between rotational dynamic responses and vibration band gaps were investigated. These attenuation regions of responses show good agreement with the frequency of Bragg band gaps. Lastly, we explained the locally resonant phononic crystals band gaps form mechanism from the point of mechanical impedance mismatch theory, results show that the peak frequency of impedance mismatch defines the begin of both LRs and Bragg band gaps. In essence, the locally resonant is the same as periodic support from the impedance theory. The results of this paper could give some valuable suggestions on the vibration control of pipeline system.
{"title":"Torsional Wave Propagation and Vibration Reducing of Phononic Crystal Pipe with Periodic Torsional Support","authors":"Jiang-hai Wu, Hongzhen Zhu, Yu-dong Sun, Mingzhu Su, Z. Yin","doi":"10.1115/1.4055066","DOIUrl":"https://doi.org/10.1115/1.4055066","url":null,"abstract":"\u0000 In this paper, torsional vibration band gap properties of fluid filled pipe were studied by using the transfer matrix method (TMM). Compared with the results carried by FEM software, the established torsional dynamic model and proposed method were verified. The effects of pipe wall`s material and parameters of support on the torsional vibration band gap properties were analyzed. Furthermore, the relationship between rotational dynamic responses and vibration band gaps were investigated. These attenuation regions of responses show good agreement with the frequency of Bragg band gaps. Lastly, we explained the locally resonant phononic crystals band gaps form mechanism from the point of mechanical impedance mismatch theory, results show that the peak frequency of impedance mismatch defines the begin of both LRs and Bragg band gaps. In essence, the locally resonant is the same as periodic support from the impedance theory. The results of this paper could give some valuable suggestions on the vibration control of pipeline system.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43899851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhen Chen, Tao Li, Yanqin Yang, Yang Zhou, Yunsheng Liu
Pressure vessel is the key device of the FPSO oil and gas processing module. The internal crude oil generates an impact load on the inner wall under the action of the ship rolling motion, resulting in stress concentration or even cracking on the head, which seriously threatens the safety of offshore oil mining and FPSO workers. Take No. 118 FPSO pressure vessel as an example, the researches are carried out by considering the actual sea states in the South China Sea. The ship motion response equations are established; a dynamic evaluation study is carried out on the safety evaluation and analysis of the key structure of the pressure vessel based on FLUENT numerical simulation calculations, the results show that the key structure of the pressure vessel Safety, its stress value is positively correlated with sea state level and filling coefficient. The pressure vessel scale model experiment was carried out with an electric six-degree-of-freedom experimental platform, and the change rule of the measured point test was basically consistent with the simulation value, and the numerical error was only 11.804%, which verified the accuracy of the simulation model. The research results provide guidance for FPSO pressure vessel structure design and prior maintenance, and the test method provides reference for FPSO pressure vessel simulation test and structure design.
{"title":"Safety Analysis and Experimental Research on the Key Structure of FPSO Pressure Vessel under the Complex Sea States","authors":"Zhen Chen, Tao Li, Yanqin Yang, Yang Zhou, Yunsheng Liu","doi":"10.1115/1.4055007","DOIUrl":"https://doi.org/10.1115/1.4055007","url":null,"abstract":"\u0000 Pressure vessel is the key device of the FPSO oil and gas processing module. The internal crude oil generates an impact load on the inner wall under the action of the ship rolling motion, resulting in stress concentration or even cracking on the head, which seriously threatens the safety of offshore oil mining and FPSO workers. Take No. 118 FPSO pressure vessel as an example, the researches are carried out by considering the actual sea states in the South China Sea. The ship motion response equations are established; a dynamic evaluation study is carried out on the safety evaluation and analysis of the key structure of the pressure vessel based on FLUENT numerical simulation calculations, the results show that the key structure of the pressure vessel Safety, its stress value is positively correlated with sea state level and filling coefficient. The pressure vessel scale model experiment was carried out with an electric six-degree-of-freedom experimental platform, and the change rule of the measured point test was basically consistent with the simulation value, and the numerical error was only 11.804%, which verified the accuracy of the simulation model. The research results provide guidance for FPSO pressure vessel structure design and prior maintenance, and the test method provides reference for FPSO pressure vessel simulation test and structure design.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46052866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Orynyak, Vladyslav Marchenko, R. Mazuryk, A. Oryniak
There are dozens of formulas in literature and standards for residual strength calculation of the pressurized ductile pipes with axial rectangular defect. Their accuracy is usually characterized by so called “model error” notion. The latter is established as the averaged deviance of experimental data from the calculated results. In fact, the determined in such way model error is partly related to the validity and range of the chosen experimental data. The idea of our work is to introduce the notion of “targeted model error”. It is expected to characterize the accuracy of given formula for the particular defect only with given ratio of its dimensions, which is named as the “point of interest”. So, every experiment can give the contribution to the targeted model error according to its weight on the point of interest. These weights are subjectively established based on the difference between the dimensionless residual strengths calculated for the point of interest and for the real defect dimensions of the considered experiment. Practical examples of determination of the targeted model errors are performed for the ratios of the defect depth to wall thickness equal to 0.5, 0.6, 0.7 and 0.8 for three well-known formulas - ASME, PPCORC and O-formula.
{"title":"Targeted Model Error Determination for Limit Load Formulas for Axial Surface Defect in a Pressurized Pipe","authors":"I. Orynyak, Vladyslav Marchenko, R. Mazuryk, A. Oryniak","doi":"10.1115/1.4055008","DOIUrl":"https://doi.org/10.1115/1.4055008","url":null,"abstract":"\u0000 There are dozens of formulas in literature and standards for residual strength calculation of the pressurized ductile pipes with axial rectangular defect. Their accuracy is usually characterized by so called “model error” notion. The latter is established as the averaged deviance of experimental data from the calculated results. In fact, the determined in such way model error is partly related to the validity and range of the chosen experimental data. The idea of our work is to introduce the notion of “targeted model error”. It is expected to characterize the accuracy of given formula for the particular defect only with given ratio of its dimensions, which is named as the “point of interest”. So, every experiment can give the contribution to the targeted model error according to its weight on the point of interest. These weights are subjectively established based on the difference between the dimensionless residual strengths calculated for the point of interest and for the real defect dimensions of the considered experiment. Practical examples of determination of the targeted model errors are performed for the ratios of the defect depth to wall thickness equal to 0.5, 0.6, 0.7 and 0.8 for three well-known formulas - ASME, PPCORC and O-formula.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63503691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The cutout and temperature loading influences on the nonlinear frequencies of the laminated shell structures are predicted numerically using two different types of geometrical nonlinear strain-displacement relationships to count the large deformation. The displacement of any generic point on the structural panel is derived using the third-order shear deformation theory (TSDT). Moreover, the direct iterative method has been adopted to obtain the nonlinear eigenvalues in conjunction with the isoparametric finite element (FE) steps. The present analysis includes the effect of temperature and the temperature-dependent composite elastic properties on the thermoelastic frequencies. This study intends to establish the Green- Lagrange type of nonlinear strain's efficacy in computing the nonlinear frequency of layered structure with and without cutout instead of von-Karman strain kinematics. The numerical model's validity has been established by comparing the results to previously published results. In addition, experimentally obtained fundamental frequency values of few modes are compared to numerical proposed numerical results under the thermal loading. Finally, the effects of cutout (shape and size) and the associated structural geometrical parameters on the nonlinear thermal frequency responses of the laminated structure are expressed in the final output form.
{"title":"Nonlinear Thermoelastic Numerical Frequency Analysis and Experimental Verification of Cutout Abided Laminated Shallow Shell Structure","authors":"H. C. Dewangan, S. Panda","doi":"10.1115/1.4054843","DOIUrl":"https://doi.org/10.1115/1.4054843","url":null,"abstract":"\u0000 The cutout and temperature loading influences on the nonlinear frequencies of the laminated shell structures are predicted numerically using two different types of geometrical nonlinear strain-displacement relationships to count the large deformation. The displacement of any generic point on the structural panel is derived using the third-order shear deformation theory (TSDT). Moreover, the direct iterative method has been adopted to obtain the nonlinear eigenvalues in conjunction with the isoparametric finite element (FE) steps. The present analysis includes the effect of temperature and the temperature-dependent composite elastic properties on the thermoelastic frequencies. This study intends to establish the Green- Lagrange type of nonlinear strain's efficacy in computing the nonlinear frequency of layered structure with and without cutout instead of von-Karman strain kinematics. The numerical model's validity has been established by comparing the results to previously published results. In addition, experimentally obtained fundamental frequency values of few modes are compared to numerical proposed numerical results under the thermal loading. Finally, the effects of cutout (shape and size) and the associated structural geometrical parameters on the nonlinear thermal frequency responses of the laminated structure are expressed in the final output form.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41449395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Industrial facilities play a significant role in economic growth now and for the foreseeable future. However, the past earthquakes highlighted the seismic vulnerability of these facilities have resulted in huge economic losses due to operational failures. As per ASCE 7, industrial facilities could be classified as building-like and non-building-like types. In this paper, the fragility of building-like industrial facilities is focused. First, relevant design code requirements and provisions were summarized, and possible further improvements are recommended. This is followed by a review of the latest techniques, challenges, and knowledge gaps related to the fragility development for building-like industrial facilities. The review indicates gaps in fragility development and seismic loss quantification. The need for consistent design standards, component interdependencies, robust seismic modeling and analysis techniques, and improvements in decision procedure are recommended.
{"title":"Review of Seismic Fragility and Loss Quantification of Building-Like Industrial Facilities","authors":"A. Alfanda, K. Dai, Jianze Wang","doi":"10.1115/1.4054844","DOIUrl":"https://doi.org/10.1115/1.4054844","url":null,"abstract":"\u0000 Industrial facilities play a significant role in economic growth now and for the foreseeable future. However, the past earthquakes highlighted the seismic vulnerability of these facilities have resulted in huge economic losses due to operational failures. As per ASCE 7, industrial facilities could be classified as building-like and non-building-like types. In this paper, the fragility of building-like industrial facilities is focused. First, relevant design code requirements and provisions were summarized, and possible further improvements are recommended. This is followed by a review of the latest techniques, challenges, and knowledge gaps related to the fragility development for building-like industrial facilities. The review indicates gaps in fragility development and seismic loss quantification. The need for consistent design standards, component interdependencies, robust seismic modeling and analysis techniques, and improvements in decision procedure are recommended.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46103801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Engineering Critical Assessment (ECA) guidelines contain rules to assess flaw interaction. Major flaw dimensions (depth or height and length) are typically characterized assuming the flaws to be contained entirely within a bounding rectangle through a procedure known as flaw idealization. In fracture mechanics based calculations, flaws are often assumed to be (semi-)elliptical when evaluating possible interaction. This paper investigates the implication of this simplification for the specific case of two identical co-planar surface breaking flaws. Two flaw shapes are considered and compared: semi-elliptical and canoe-shaped (quarter-circular ends with constant depth elsewhere). Especially for long and shallow flaws, the canoe-shaped configuration best approximates the bounding rectangle, whereas the semi-elliptical shape only touches the bounding rectangle at three points (deepest point and two points at the surface). Several flaw dimensions and spacing distances are studied through an extensive parametric study comprising both linear elastic and elastic-plastic finite element simulations. The results, evaluated in terms of stress intensity factor (SIF) and J-integral, show that the flaw shape idealization, particularly for long and shallow flaws, can significantly affect the degree of interaction between identical co-planar flaws. The inconsistency between semi-elliptical and canoe-shaped flaw shapes is observed in a linear elastic analysis and becomes more pronounced at higher loading levels evaluated in elastic-plastic analyses
{"title":"A Study On Effects of Flaw Shape Idealization On the Interaction of Co-Planar Surface Flaws Subjected to Tension Load","authors":"Kaveh Samadian, S. Hertelé, W. De Waele","doi":"10.1115/1.4054811","DOIUrl":"https://doi.org/10.1115/1.4054811","url":null,"abstract":"\u0000 Engineering Critical Assessment (ECA) guidelines contain rules to assess flaw interaction. Major flaw dimensions (depth or height and length) are typically characterized assuming the flaws to be contained entirely within a bounding rectangle through a procedure known as flaw idealization. In fracture mechanics based calculations, flaws are often assumed to be (semi-)elliptical when evaluating possible interaction. This paper investigates the implication of this simplification for the specific case of two identical co-planar surface breaking flaws. Two flaw shapes are considered and compared: semi-elliptical and canoe-shaped (quarter-circular ends with constant depth elsewhere). Especially for long and shallow flaws, the canoe-shaped configuration best approximates the bounding rectangle, whereas the semi-elliptical shape only touches the bounding rectangle at three points (deepest point and two points at the surface). Several flaw dimensions and spacing distances are studied through an extensive parametric study comprising both linear elastic and elastic-plastic finite element simulations. The results, evaluated in terms of stress intensity factor (SIF) and J-integral, show that the flaw shape idealization, particularly for long and shallow flaws, can significantly affect the degree of interaction between identical co-planar flaws. The inconsistency between semi-elliptical and canoe-shaped flaw shapes is observed in a linear elastic analysis and becomes more pronounced at higher loading levels evaluated in elastic-plastic analyses","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45790492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Superheater tubes are critical boiler components that operate at relatively higher temperatures and pressure. Amongst the primary concerns for these tubes is the deposition of ash particles on the tube surface, leading to the reduced thickness of the tube due to material corrosion, consequently causing early creep failure of the component. In this research, a novel tube design has been proposed which resembles a teardrop or ogive shape to reduce the drag and concurrently improve the creep life of the superheater tubes. To administer the practicality of novel tubes, metal Additive Manufacturing, for instance, Laser-Powder Bed Fusion, has been proposed. These unconventional designs were assessed and compared with the baseline circular tube design for mechanical design requirements and the particle and flue gas flow characteristics around the differently shaped tubes. A thermo-mechanical Finite Element Analysis (FEA) was performed for hoop stress calculations. This study also emphasizes on effect of circumferential thermal variation on hoop stress distribution in tubes. Therefore, a detailed 2D thermal simulation has been performed to report the circumferential thermal variation on the tube. A Computational Fluid Dynamics (CFD) analysis coupled with particle tracing was performed for gas flow visualization and particle tracing around the proposed shapes and baseline circular-shaped tube design. The Schlieren Optic setup was built and leveraged for qualitative validation of the proposed design. The complete design methodology established in the paper shows teardrop-shaped tubes better in terms of drag and creep life in contrast to the circular-shaped tube.
{"title":"Novel Tube Design for Superheater Heat Exchanger Enabled via Additive Manufacturing","authors":"Vanshika Singh, S. Babu, M. Kirka, A. Kulkarni","doi":"10.1115/1.4054727","DOIUrl":"https://doi.org/10.1115/1.4054727","url":null,"abstract":"\u0000 Superheater tubes are critical boiler components that operate at relatively higher temperatures and pressure. Amongst the primary concerns for these tubes is the deposition of ash particles on the tube surface, leading to the reduced thickness of the tube due to material corrosion, consequently causing early creep failure of the component. In this research, a novel tube design has been proposed which resembles a teardrop or ogive shape to reduce the drag and concurrently improve the creep life of the superheater tubes. To administer the practicality of novel tubes, metal Additive Manufacturing, for instance, Laser-Powder Bed Fusion, has been proposed. These unconventional designs were assessed and compared with the baseline circular tube design for mechanical design requirements and the particle and flue gas flow characteristics around the differently shaped tubes. A thermo-mechanical Finite Element Analysis (FEA) was performed for hoop stress calculations. This study also emphasizes on effect of circumferential thermal variation on hoop stress distribution in tubes. Therefore, a detailed 2D thermal simulation has been performed to report the circumferential thermal variation on the tube. A Computational Fluid Dynamics (CFD) analysis coupled with particle tracing was performed for gas flow visualization and particle tracing around the proposed shapes and baseline circular-shaped tube design. The Schlieren Optic setup was built and leveraged for qualitative validation of the proposed design. The complete design methodology established in the paper shows teardrop-shaped tubes better in terms of drag and creep life in contrast to the circular-shaped tube.","PeriodicalId":50080,"journal":{"name":"Journal of Pressure Vessel Technology-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44232309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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