Power Density and Thermochemical Properties of Hydrogen Magnetohydrodynamic (H2MHD) Generators at Different Pressures, Seed Types, Seed Levels, and Oxidizers DOI Creative Commons
Osama A. Marzouk

Hydrogen, Год журнала: 2025, Номер 6(2), С. 31 - 31

Опубликована: Май 2, 2025

Hydrogen and some of its derivatives (such as e-methanol, e-methane, e-ammonia) are promising energy carriers that have the potential to replace conventional fuels, thereby eliminating their harmful environmental impacts. An innovative use hydrogen a zero-emission fuel is forming weakly ionized plasma by seeding combustion products with small amount an alkali metal vapor (cesium or potassium). This formed can be used working fluid in supersonic open-cycle magnetohydrodynamic (OCMHD) power generators. In these OCMHD generators, direct-current (DC) electricity generated straightforwardly without rotary turbogenerators. current study, we quantitatively qualitatively explore levels electric conductivity resultant volumetric output density typical channel, where thermal equilibrium accelerated at Mach number two (Mach 2) while being subject strong applied magnetic field (applied magnetic-field flux density) five teslas (5 T), temperature 2300 K (2026.85 °C). We varied total pressure pre-ionization seeded gas mixture between 1/16 atm 16 atm. also seed level 0.0625% 16% (pre-ionization mole fraction). type cesium potassium. oxidizer air (oxygen–nitrogen mixture, 21–79% mole) pure oxygen. Our results suggest ideal reach exceptional beyond 1000 MW/m3 (or 1 kW/cm3) provided absolute reduced about 0.1 only for rather than Under atmospheric air–hydrogen (1 pressure) 1% fraction vapor, theoretical 410.828 case 104.486 The enhanced using any following techniques: (1) reducing pressure, (2) instead potassium seeding, (3) oxygen (if unchanged). A 4% fraction) recommended. Much lower much higher may harm performance. maximizes not necessarily same conductivity, this due additional thermochemical changes caused additive seed. For example, combustion, maximized 6% fraction, 5%. present comprehensive set computed properties gases, such molecular weight speed sound.

Язык: Английский

Effect of non-linear thermal radiation and Cattaneo-Christov heat and mass fluxes on the flow of Williamson hybrid nanofluid over a stretching porous sheet DOI Creative Commons
Asfaw Tsegaye Moltot, Eshetu Haile Gorfie, Gurju Awgichew

и другие.

F1000Research, Год журнала: 2025, Номер 14, С. 210 - 210

Опубликована: Март 31, 2025

Background Hybrid nanofluids, consisting of two distinct nanoparticles dispersed in a base fluid, are widely used industries requiring enhanced heat and mass transfer, such as cooling systems exchangers. These fluids improve thermal conductivity fluid dynamics, leading to better management energy efficiency. This study investigates the combined effects non-linear radiation, Cattaneo-Christov fluxes, other factors on three-dimensional flow, heat, transfer Williamson hybrid nanofluid. The flow occurs over stretching porous sheet subjected an external magnetic field, Joule heating, chemical reactions, generation. Methods Copper (Cu) aluminum oxide (Al₂O₃) suspended ethylene glycol (C₂C₆O₂) form governing partial differential equations transformed into ordinary using similarity transformations solved numerically with MATLAB’s bvp4c solver. examines various parameters, including ratio, nanoparticle volume fraction, relaxation times for concentration effects. Results validated against existing literature. findings reveal that higher ratio reduces velocity, temperature, profiles, local Nusselt Sherwood numbers, while also lowering skin friction secondary velocity. Increasing fraction decreases velocity temperature profiles but enhances friction, Nusselt, numbers. Concentration decline time, increases longer time. Conclusions In conclusion, Cu−Al₂O₃/C₂C₆O₂ nanofluids demonstrate superior capabilities compared mono-nanofluids. performance is significantly influenced by parameters times, providing valuable insights applications.

Язык: Английский

Процитировано

0
Numerical Investigation of a Fractional Order Differential Human Papillomavirus Model Using Time Delay Neural Network DOI Creative Commons

Dostdar Ali,

Faqir Shah,

Asad Ullah

и другие.

Partial Differential Equations in Applied Mathematics, Год журнала: 2025, Номер unknown, С. 101196 - 101196

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Magnetohydrodynamic (MHD) boundary layer flow of Williamson nanofluid in a porous medium: effects of viscous dissipation, heat source, and chemical reaction with applications in thermal and biomedical systems DOI

Sanjeeva Reddy Mandadi,

M. Anil Kumar

Modeling Earth Systems and Environment, Год журнала: 2025, Номер 11(3)

Опубликована: Апрель 16, 2025

Язык: Английский

Процитировано

0
Comparative heat transfer analysis using synthesized nanofluids of SiO2, Al2O3, CuO, and MgO of a Car Radiator DOI

R.A. Urthi,

M.I. Jahirul,

Md. Noor-A-Alam Siddiki

и другие.

Thermal advances., Год журнала: 2025, Номер unknown, С. 100049 - 100049

Опубликована: Апрель 1, 2025

Язык: Английский

Процитировано

0
Power Density and Thermochemical Properties of Hydrogen Magnetohydrodynamic (H2MHD) Generators at Different Pressures, Seed Types, Seed Levels, and Oxidizers DOI Creative Commons
Osama A. Marzouk

Hydrogen, Год журнала: 2025, Номер 6(2), С. 31 - 31

Опубликована: Май 2, 2025

Hydrogen and some of its derivatives (such as e-methanol, e-methane, e-ammonia) are promising energy carriers that have the potential to replace conventional fuels, thereby eliminating their harmful environmental impacts. An innovative use hydrogen a zero-emission fuel is forming weakly ionized plasma by seeding combustion products with small amount an alkali metal vapor (cesium or potassium). This formed can be used working fluid in supersonic open-cycle magnetohydrodynamic (OCMHD) power generators. In these OCMHD generators, direct-current (DC) electricity generated straightforwardly without rotary turbogenerators. current study, we quantitatively qualitatively explore levels electric conductivity resultant volumetric output density typical channel, where thermal equilibrium accelerated at Mach number two (Mach 2) while being subject strong applied magnetic field (applied magnetic-field flux density) five teslas (5 T), temperature 2300 K (2026.85 °C). We varied total pressure pre-ionization seeded gas mixture between 1/16 atm 16 atm. also seed level 0.0625% 16% (pre-ionization mole fraction). type cesium potassium. oxidizer air (oxygen–nitrogen mixture, 21–79% mole) pure oxygen. Our results suggest ideal reach exceptional beyond 1000 MW/m3 (or 1 kW/cm3) provided absolute reduced about 0.1 only for rather than Under atmospheric air–hydrogen (1 pressure) 1% fraction vapor, theoretical 410.828 case 104.486 The enhanced using any following techniques: (1) reducing pressure, (2) instead potassium seeding, (3) oxygen (if unchanged). A 4% fraction) recommended. Much lower much higher may harm performance. maximizes not necessarily same conductivity, this due additional thermochemical changes caused additive seed. For example, combustion, maximized 6% fraction, 5%. present comprehensive set computed properties gases, such molecular weight speed sound.

Язык: Английский

Процитировано

0