Natural convection effects in insulation layers of spherical cryogenic storage tanks

Review Chemistry, Physical

Effective thermal conductivity of insulation materials for cryogenic LH2 storage tanks: A review

Ram R. Ratnakar et al.

Summary: This work provides an accurate estimation of the effective thermal conductivity of insulation materials, such as powders, foams, fibrous materials, and multilayer systems. Experimental data and correlations are reviewed, and a first principles-based correlation is proposed to estimate the dependence of effective conductivity on various factors. The proposed correlation is validated using available experimental data and further improvements and testing are discussed.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2023)

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Article Thermodynamics

Non-Oberbeck-Boussinesq effects and sub-critical primary bifurcations in porous media convection

Swapnil Sharma et al.

Summary: This work examines the impact of large physical property variation and non-Oberbeck-Boussinesq (nonOB) effects on the bifurcation of convective states in gas filled porous insulation layers. It shows that the well-known super-critical bifurcation changes to sub-critical bifurcation when the temperature difference exceeds a critical value. Furthermore, under large temperature variations, the convective solutions could be highly asymmetric with the center of circulation closer to the cold boundary.

INTERNATIONAL JOURNAL OF THERMAL SCIENCES (2023)

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Article Physics, Multidisciplinary

Linear and weakly non-linear stability analyses of Rayleigh-Benard convection in a water-saturated porous medium with different shapes of copper nanoparticles

K. M. Lakshmi et al.

Summary: The Rayleigh-Benard convection of a nanoliquid-saturated porous medium confined in a very shallow enclosure is theoretically investigated using the modified Buongiorno-Brinkman model. The analytical and simulation results are compared and the effects of different parameters on the system's onset and heat transport are examined. The study provides insights into the control and optimization of heat transfer in such systems.

EUROPEAN PHYSICAL JOURNAL PLUS (2022)

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Article Chemistry, Physical

Structural design of flexible vacuum insulation system for large-scale LH2 storage

Hyunjun Park et al.

Summary: This study introduces a new vacuum insulation system for large-scale LH2 storage tanks, consisting of a flexible vacuum membrane and a load-transferring insulation layer. The system's overall performance was demonstrated and validated in extreme cooling conditions, showing its capability to withstand harsh environments.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2022)

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Article Mechanics

Onset and nonlinear regimes of convection in an inclined porous layer subject to a vertical temperature gradient

T. P. Lyubimova et al.

Summary: This study focuses on thermal buoyancy convection in an inclined porous layer saturated with fluid. The research shows that three-dimensional perturbations are more dangerous than two-dimensional ones, with the angle of inclination of the layer playing a significant role in the disturbances.

PHYSICS OF FLUIDS (2022)

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Review Chemistry, Physical

Hydrogen supply chain and challenges in large-scale LH2 storage and transportation

Ram R. Ratnakar et al.

Summary: Hydrogen is considered a future fuel with LH2 technology having great potential. Development of cost-effective and safe technologies for storage and transportation is crucial for commercial widespread use. Storage and delivery are key enablers for global hydrogen technology but face challenges due to extremely low temperature constraints.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY (2021)

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Article Electrochemistry