Modelling ruptures of buried high pressure dense phase CO2 pipelines in carbon capture and storage applications - Part I. Validation

Carbon dioxide (CO2) capture and storage presents a short-term option for significantly reducing the amount of CO2 released into the atmosphere and mitigating the effects of climate change. To this end, National Grid initiated the COOLTRANS research programme to consider the pipeline transportation of high pressure dense phase CO2, including the development and application of a mathematical model for predicting the sonic near-field dispersion of pure CO2 following the venting or failure of such a pipeline. Here, the application of this model to the rupture of a buried pipeline is considered and compared to experimental data obtained through the COOLTRANS programme. The rupture experiment was performed on a 230 m length of 152 mm external diameter pipeline with 300 mm soil cover, equivalent to approximately 1/4 scale when compared to the proposed full-scale 600 mm (24-inch) diameter pipelines with 1.2 m soil cover on average proposed in the UK. The experiment was performed in a pre-formed crater based on experimentally formed craters in other experiments. The comparison demonstrates reasonable quantitative and qualitative agreement. Such validated dispersion flow, to be applied to full-scale rupture modelling in Part II, defines novel, robust, thermodynamically accurate multi-phase source conditions, that enable far-field computational fluid dynamics studies and feed into pragmatic quantified risk assessment models

High pressure CO2 CCS pipelines: Comparing dispersion models with multiple experimental datasets

Carbon capture and storage (CCS) presents the short-term option for significantly reducing the amount of carbon dioxide (CO2) released into the atmosphere from the combustion of fossil fuels, thereby mitigating the effects of climate change. Enabling CCS requires the development of capture, storage and transport methodologies. The safe transport of CO2 in CCS scenarios can be achieved through pipelines or by shipping. Either way, transport and temporary storage of pressurised liquid CO2 will be required and subject to quantitative risk assessment, which includes the consideration of the low-risk, low-probability puncture or rupture scenario of such a pipeline, ship or storage facility. In this work, we combine multiple experimental datasets all concerned with the atmospheric free release of pure and impure liquid CO2 from CCS-transport-chain-relevant high pressure reservoirs and perform the first multiple dataset comparison to numerical models for both pure and impure jets in dry ambient air with no water vapour. The results validate the numerical approach adopted and for the prediction of such releases, highlight the significance of the mixture fraction at the release point, over the mixture composition itself. A new method for impure CO2 dispersion modelling is introduced and limited preliminary comparisons of impure CO2 data and predictions are performed. No clear difference between pure and impure releases is found for the cases considered

Scenario-based strategic planning and strategic management in family firms

This cumulative dissertation covers the concepts of scenario-based strategic planning and strategic management in family firms over five articles. The first article gives an overview of the cumulative dissertation explaining the research gap, approach and contribution of the dissertation. The paper highlights the two research areas covered by the dissertation with two articles focusing on scenario-based strategic planning and two on strategic management in family firms. The second article is the first of two focusing on scenario-based strategic planning. It introduces and describes a set of six tools facilitating the implementation of scenario-based strategic planning in corporate practice. The third paper adapts these tools to the financial management and controlling context in private companies highlighting the tools’ flexibility in managing uncertain and volatile environments. The fourth article is the first of two focusing on strategic management in family firms. It analyzes organizational ambidexterity as a factor explaining family firm performance. The article shows that a high level of organizational ambidexterity in family firms leads to a higher family firm performance. The final paper concludes the dissertation examining the tendency of family firms to focus on capability exploration or resource exploitation over different generations managing the family firm.:I. SCENARIO-BASED STRATEGIC PLANNING AND STRATEGIC MANAGEMENT IN FAMILY FIRMS … 1 1. Research question and goal of the dissertation … 2 2. Summary of papers … 8 2.1. Contribution … 12 2.2. Implications and further research … 16 II. SIX TOOLS FOR SCENARIO-BASED STRATEGIC PLANNING AND THEIR APPLICATION … 25 1. Introducing tools one and two: The framing checklist and 360° stakeholder feedback … 27 1.1. The framing checklist … 27 1.2. Description of the framing checklist … 29 1.3. 360° stakeholder feedback … 36 1.3.1. Existing perceptions, blind spots and weak signals … 37 1.3.2. Description of 360° stakeholder feedback … 38 1.4. Evaluation of the framing checklist and 360° stakeholder feedback … 44 2. Applying frameworks one and two: The framing checklist and 360° stakeholder feedback in the European airline industry … 46 2.1. Introduction … 46 2.2. The framing checklist … 46 2.3. 360° stakeholder feedback … 48 3. Introducing tools three and four: The impact/uncertainty grid and the scenario matrix … 53 3.1. The impact/uncertainty grid … 53 3.2. Description of the impact/uncertainty grid … 55 3.3. The scenario matrix … 57 3.4. Description of the scenario matrix … 62 3.5. Evaluating the impact/uncertainty grid and the scenario matrix … 67 4. Applying frameworks three and four: The impact/uncertainty grid and the scenario matrix in the European airline industry … 69 4.1. Introduction … 69 4.2. The impact/uncertainty grid … 69 4.3. The scenario matrix … 71 5. Introducing tools five and six: The strategy manual and the monitoring cockpit … 87 5.1. Introduction … 87 5.2. The strategy manual … 87 5.3. Description of the strategy manual … 91 5.4. The scenario cockpit … 95 5.5. Description of the scenario cockpit … 96 5.6. Evaluating the strategy manual and the scenario cockpit ..................... 99 6. Applying frameworks five and six: The strategy manual and the scenario cockpit in the European airline industry … 102 6.1. The strategy manual … 102 6.2. The scenario cockpit … 105 III. SZENARIOBASIERTE STRATEGISCHE PLANUNG IN VOLATILEN UMFELDERN … 111 1. Einführung: Unternehmen agieren in einer zunehmend volatilen Umwelt … 112 2. Volatilität als Herausforderung für die strategische Planung … 112 3. Szenariobasierte strategische Planung als Lösungsansatz für Planung unter Volatilität …114 3.1. Grundlagen der szenariobasierten strategischen Planung … 114 3.2. Prozess der szenariobasierten strategischen Planung … 115 4. Zusammenfassung ... 122 IV. ORGANIZATIONAL AMBIDEXTERITY AND FAMILY FIRM PERFORMANCE … 125 1. Introduction … 126 2. Theory and Hypotheses … 127 3. Methodology … 131 3.1. Research Design and Sample Generation … 131 3.2. Measures … 133 4. Analysis and Results … 135 5. Discussion and Conclusion … 139 V. THE IMPACT OF SUCCESOR GENERATION DISCOUNT IN FAMILY FIRMS: EXAMINING NONLINEAR EFFECTS ON EXPLORATION AND EXPLOITATION … 150 1. Introduction … 151 2. The RBV and the importance of exploration and exploitation … 154 3. The importance of exploration and exploitation in family firms … 156 4. The impact of generational involvement on exploration and exploitation in family firms … 159 5. Methodology … 164 5.1. Constructs … 165 5.2. Results … 167 6. Discussion … 172 6.1. Implications for theory and practice … 175 6.2. Study limitations and future research … 176 6.3. Conclusion … 17

Study of the thermohydraulics of CO2 discharge from a high pressure reservoir

An experimental test set up has been constructed to carry out controlled CO2 release experiments from a high pressure vessel. The test set up is made up of a 500l stainless steel vessel where CO2 can be introduced up to high pressures and where controlled releases can be conducted. The work objective is to get experimental data that help to understand the thermo-hydraulic behavior of CO2 when discharged from a pressurized vessel and to further improve and validate existing and newly developed release and dispersion models. The aim is to get better insight into the fluid behavior in the vessel as well as in the discharged jet, and to understand the relation between the thermodynamic regime inside the high pressure medium and the mass release rate and jet zone characteristics during the release process.In this experimental work, the impact of varying the release orifice diameter and the initial vessel pressure on the CO2 discharge will be examined and analyzed, and the different thermodynamic regimes inside and outside the high pressure medium will be described and interpreted. © 2013 Elsevier Ltd

Medium scale CO2 releases

International audienceThe scale of proposed carbon dioxide (CO2) capture and storage (CCS) chains also draws attention to the hazards posed by the transport mode, enabling the link from source to sink. As such, the adverse consequences of an accidental release from transport pipelines or other equipment containing CO2 at high pressure in a dense-phase (supercritical or liquid) state are (re)considered in theory and in practice. Several experimental observations of large-scale CO2 releases have been made, and yet the physics and thermodynamics involved are not fully understood. The work presented here provides a database focused on the specificities of the release and the dispersion of the carbon dioxide cloud in case of substantial variations of storage (temperature and pressure) and discharge conditions (nozzle size)

Activation of protein kinase C enhances the infection of endothelial cells by human cytomegalovirus.

Department of Medical Microbiology, University of Maastricht, The Netherlands. [email protected] The infection of cultured endothelial cells with human cytomegalovirus (HCMV) is generally limited to less than 10% of the cells in contrast to HCMV infection of fibroblasts, where essentially all cells can be infected. It is known that HCMV infection influences a number of signal transduction pathways of infected cells. We therefore questioned whether, conversely, the infectivity of human umbilical vein endothelial cells could be influenced by the deliberate activation of these pathways. When endothelial cells were treated prior to infection with phorbol myristoyl acetate, an activator of protein kinase C, the number of HCMV-positive cells increased two to three times. On the other hand, pretreatment of the cells with RO 31-8220, a specific protein kinase C inhibitor, or with staurosporine, a general protein kinase inhibitor, resulted in a decreased infection level and in abolishment of the PMA-induced effect. Pretreatment with the protein phosphatase inhibitor, okadaic acid, caused a slight increase in infectivity, whereas pretreatment with the protein tyrosine kinase inhibitor, genistein, was without effect. Furthermore, neither forskolin and ilomedine, compounds known to activate the endothelial adenylate cyclase, nor the calcium ionophore A23187 were able to influence HCMV infectivity. It is concluded that: (a) the HCMV infection level of unstimulated endothelial cells is influenced by the basal level of protein kinase C; and (b) stimulation of protein kinase C prior to infection results in an increase of infection by HCMV

Thermodynamic aspects of an LNG tank in fire and experimental validation

Mechanical behaviour of a Liquefied Natural Gas (LNG) tank and the thermodynamic behaviour of its containment under extreme heat load - for instance when subjected to external fire source as might occur during an accident -Are extremely important when addressing safety concerns. In a scenario where external fire is present and consequent release of LNG from pressure relief valves (PRV) has occurred, escalation of the fire might occur causing difficulty for the fire response teams to approach the tank or to secure the perimeter. If the duration of the tank exposure to fire is known, the PRV opening time can be estimated based on the thermodynamic calculations. In this paper, such an accidental scenario is considered, relevant thermodynamic equations are derived and presented. Moreover, an experiment is performed with liquid nitrogen and the results are compared to the analytical ones. The analytical results match very well with the experimental observations. The resulting analytical models are suitable to be applied to other cryogenic liquids. © The Authors, published by EDP Sciences, 2017. DANTEC DYNAMICS GmbH; LAVISION; MIT s.r.o.; TSI Gmb

A composite equation of state for the modeling of sonic carbon dioxide jets in carbon capture and storage scenarios

The development of a novel composite two-phase method to predict the thermodynamic physical properties of carbon dioxide (CO) above and below the triple point, applied herein in the context of Reynolds-Averaged Navier-Stokes computational modeling has been detailed here. A number of approaches have been combined to make accurate predictions in all three phases (solid, liquid, and gas) and at all phase changes for application in the modeling of releases of CO at high pressure into the atmosphere. Predictions of a free release of CO into the atmosphere from a reservoir at a pressure of 10 MPa and a temperature of 283 K, typical of transport conditions in carbon capture and storage scenarios, is examined. A comparison of the results shows that the sonic CO jet that forms requires a three-phase equation of state including the latent heat of fusion to realistically simulate its characteristics