Theoretical approach and experimental verification of the role of diffusive transport under binary scaling conditions. (June 2016)

• Record Type: Journal Article
• Authors: de Crombrugghe, G.; Morgan, R.; Chazot, O.
• Is Part Of: International journal of heat and mass transfer. Volume 97(2016:Jun.)
• Page Start: 675
• Page End: 682
• Publication Date: 2016-06
• Subjects: Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2016.02.018
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: The binary scaling law is developed from the equation for the conservation of mass. Diffusive transport is in theory appropriately scaled between binary scaled flows. Experiments confirm that diffusive transport is appropriately scaled. Development of a scaling law for heat fluxes in subsonic high-enthalpy flows. The binary scaling law can be used in subsonic high-enthalpy facilities. Abstract: The binary scaling law is commonly used to study the aerothermodynamics of hypersonic vehicles in ground-based facilities. Its application is usually restricted to situations where diffusive transport is neglected. However, as demonstrated in this paper, the diffusion processes are embedded in the Péclet and wall Damköhler numbers, which are conserved through the duplication of the binary scaling similitude parameters, namely the nature of the gas, the free-stream enthalpy h ∞ and the product of a density and a length-scale of the flow ρ L . The role of diffusion is first demonstrated theoretically, and then experimentally through the obtention of binary scaled boundary layers in the Plasmatron, a plasma wind tunnel at the von Karman Institute. The stagnation point heat fluxes were measured and exhibit a good agreement with the theoretical scaling law. This also validates the use of the binary scaling law in subsonic high enthalpy flows.