-The steady-state heat transfer in laminar flow of liquid egg yolk -an important pseudoplastic fluid food -in circular and concentric annular ducts was experimentally investigated. The average convection heat transfer coefficients, determined by measuring temperatures before and after heating sections with constant temperatures at the tube wall, were used to obtain simple new empirical expressions to estimate the Nusselt numbers for fully established flows at the thermal entrance of the considered geometries. The comparisons with existing correlations for Newtonian and non-Newtonian fluids resulted in excellent agreement. The main contribution of this work is to supply practical and easily applicable correlations, which are, especially for the case of annulus, rather scarce and extensively required in the design of heat transfer operations dealing with similar shear-thinning products. In addition, the experimental results may support existing theoretical analyses.
Este artigo pretende analisar a estrutura da teoria habermasiana e de seu instrumental teórico para o estudo do “capitalismo tardio” a partir da teoria das crises contida no A Crise de Legitimação do Capitalismo Tardio, discutindo as dificuldades operacionais que este instrumental teórico pode apresentar para o estudo de dois casos empíricos: a crise do Welfare State e a crise do Estado-Nação.O objetivo primeiro é investigar em que medida a utilização deste aparelho conceitual é efetiva nas análises feitas pelo autor dos dois casos citados. Seguindo-se a isso, colocaremos algumas críticas a respeito de certas dificuldades que a construção teórica de autor pode apresentar no que diz respeito às estruturas do capitalismo avançado, procurando demonstrar que as próprias análises empíricas habermasianas apontam nessa direção.
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