The annular foam breaker is one which uses the vacuum and shear force generated by the Coanda effect to break foam. Its effectiveness in destroying drilling foam has been test in wellbore flow simulation loop experimental stand. Experimental results showed that the operating pressure of the annular foam breaker should be larger than 0.6MPa and the stabilizers concentration of the foam drilling ...

A new geometric modeling of isotropic highly-porous cellular media, e.g., open-cell metal, ceramic, and graphite foams, is developed. The modelling valid strictly for macroscopically two-dimensional heat transfer due to the fluid flow in media. Unlike current geometrical such model employs simple geometry, derived from equivalency conditions that are imposed on model’s geometry a priori, order ...

foam injection is becoming a standard conditioning agent when tunnelling with an earth-pressure balanced shield, resulting in an increasing interest in this technique. the technique is mostly based on empirical rules and experience. to be able to determine what foam and how may foam has to be injected for different soils, it is necessary to know the mechanical parameters of the foam-water-soil ...

There is tremendous potential for both small- and large-scale applications of low-temperature operational ceramic fuel cells (LT-CFCs), which operate between 350 °C 550 °C. Unfortunately, the low operating temperature CFCs was hampered by inadequate oxygen reduction electrocatalysts. In this work, electrochemical characteristics a semiconductor heterostructure composite based on WO3-CaFe2O4 dep...

The transport properties of the ceramic based refractory coating to allow proper permeation of degradation products during the pyrolysis of expanded polystyrene (EPS) foam in Lost Foam Casting (LFC) have an important influence on the success of the casting process. This paper proposes a new apparatus to evaluate the permeability of the refractory coatings in a relatively large differential pres...

Glass-ceramic scaffolds mimicking the structure of cancellous bone were produced via sponge replication technique by using a polyurethane foam as template and glass powder below 30 lm as inorganic phase. Specifically, a SiO₂-based glass of complex composition and its corresponding P₂O₅-based "specular" glass were used as materials for scaffolding. The polymeric sponge was thermally removed and ...

The development of glass-ceramic foam has received significant attention in building and construction, given its potential for sustainability. This study investigated the low-temperature route fabricating foams from mining waste. feasibility one-step or chemical-aided sintering using granite powder, a naturally sourced waste, rather than already heat-treated wastes such as glass fly ash been ex...