ANALYSIS OF PRESSURE FLUCTUATIONS DURING WATER EVAPORATION IN SPOUTED BED

Autor(es)

Marreto, R. N. ^[1] ; Peixoto, M. P. G. ^[1] ; Teixeira, C. C. C. ^[1] ; Freitas, L. A. P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, BR-14040903 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CANADIAN JOURNAL OF CHEMICAL ENGINEERING; v. 87, n. 3, p. 386-393, JUN 2009.
• Citações Web of Science: 7

Resumo

The aim of this work was to study the behaviour of conventional spouted beds during water evaporation and to analyze the pressure fluctuations at the maximum water evaporative capacity for different bed heights and air flow rates. The results showed that spout pressure drop could not indicate the proximity of maximum evaporative capacity; however this condition is denoted by a minimum in fountain height. The standard deviation and amplitude of the pressure fluctuations also showed a minimum point at the maximum water evaporation capacity. The frequency domain analysis of pressure fluctuations revealed that the dry bed has a dominant frequency varying from 6 to 8.2 Hz and that the peak of dominant frequency tends to disappear with the increase in water feed rate. (AU)

• Processo FAPESP: 03/09447-6 - Determinacao das distribuicoes de tempos de residencia durante a secagem de pastas em leitos de jorro com inertes.
• Beneficiário: Luis Alexandre Pedro de Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Regular