Evaporation of Water from Alumina Slurry Drop Containing Dissolved Poly(vinyl alcohol)

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Yasuko Huzimori¹  Koichi Asano¹  Izumi Taniguchi¹  Naohiko Maeda¹ 

[1] Department of Chemical Engineering, Tokyo Institute of Technology

关键词: Mass Transfer;    Evaporation;    Drying;    Slurry Drop;    Poly(vinyl alcohol);    Atomization;   

DOI  :  10.1252/jcej.32.449

来源: Maruzen Company Ltd

【 摘 要 】

References(16)Cited-By(2)A new method for simultaneous measurement of weight, temperature and surface area of an evaporating pendant drop in dry air has been proposed by using a precise analytical balance, a microcomputer with A-D converter, and a microscope with image acquisition system. Unsteady simultaneous measurements of weight, temperature and surface area of an alumina slurry drop and one containing dissolved poly(vinyl alcohol) (PVA) have been made for a wide range of free stream temperatures T∞ = 323–393 K and initial concentrations of PVA CPA0 = 0–10 wt% at free stream velocity U∞ = 0.72 m/s and initial concentration of fine alumina particles CA0 = 50 wt%.The dimensionless diffusion fluxes and Nusselt numbers of an alumina slurry drop are compared with those for a pure water drop and show a fairly good agreement with those for a water drop during the constant rate period of evaporation. The dimensionless diffusion fluxes of an alumina slurry drop containing dissolved PVA are affected by the initial concentrations of PVA and free stream temperatures and show a large deviation from those for a water drop, while Nusselt numbers show a fairly good agreement with those for a water drop.

【 授权许可】

Unknown