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The heat transfer coefficient is measured locally for the entire range of vapor qualities starting from subcooled liquid to superheated vapor.
It is demonstrated that uptake of solvent vapors in the matrix polymer guarantees the increase in a composite's resistance over a wide range of vapor concentration.
The morphology is controlled by selecting the solvents with a range of vapor pressure and solubility parameter to govern respectively the evaporation rates and the polymer-solvent affinity.
The heat flux and pressure affected the heat transfer coefficient at vapor qualities less than around 0.3, while higher mass fluxes improved the heat transfer for the whole range of vapor qualities.
This paper presents new experimental results of heat transfer coefficient and pressure drop measured during condensation of R1234ze(E) and R32 in a brazed aluminum multichannels test section with 1.6 mm hydraulic diameter at 40 °C saturation temperature, mass velocity from 55 to 275 kg m−2 s−1, heat flux up to 35 kW m−2 and a complete range of vapor quality.
The experimental study was performed over a range of vapor generator temperatures from about 90 to 102 °C, evaporator temperatures from 0 to 16 °C and condenser pressures from 114 to 143 kPa, and a COP up to 0.25 was obtained.
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The comparison between two-phase pressure drop for pure refrigerant and the refrigerant oil mixture reveals that pressure drop increases with the increase of oil concentration in all ranges of vapor quality and mass velocities.
There is, however, considerable potential for the atmospheric persistence and long-range movement of vapor and droplets of semivolatile pesticides through vaporization of larger to smaller droplets, vertical air mixing resulting in increased droplet and vapor height, and deposition of droplets with subsequent re-entry into the atmosphere (Van den Berg et al. 1999; van Dijk and Guicherit 1999).
The correlations for predicting in-tube flow boiling heat transfer of ammonia water mixtures are not well established in the open literature and there is a lack of experimental measurements for the full range of composition, vapor qualities, fluid conditions, etc.
Solubility, diffusivity and permeability of toluene vapors in low-density polyethylene (LDPE) membranes of various thicknesses (approximately 48, 93, 138 and 187 μm) at different temperatures 30, 40 and 50 °C in the range of relative vapor pressure p/p0=(0.05; 0.95) were measured using new type of permeation apparatus.
We have shown that by comparing a range of solvent vapors (water and C1 C4 alcohols), the magnitude of the effect correlates to the molecular volume of the solvent molecule.
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