Navegando por Autor "MANESCHY, Carlos Edilson de Almeida"

Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Modelagem do tempo de execução de obras civis: estudo de caso na Universidade Federal do Pará
(2012-03) COUTINHO, Lêda Sílvia de Aguiar Lédo; DUARTE, André Augusto Azevedo Montenegro; NEVES, Renato Martins das; COUTINHO NETO, Benedito; MANESCHY, Carlos Edilson de Almeida; PINHEIRO, Ana Maria Guerra Seráfico
This article proposes the adoption of a numerical prognosis model to estimate the variable "execution time" for public projects in an objective way. The field work consisted of the application of statistical methods for analyzing data from projects that were bid and contracted by the Federal University of Pará (UFPA) between 2006 and 2009. Data analysis involved linear regression and transformed functions. After the stratification and initial treatment of the data, the evidence adopted for the construction of the final model was limited to 102 out of the 225 projects originally investigated, resulting in the following statistical parameters: correlation coefficient (R) of 0.899, coefficient of determination (R2) of 0.808, adjusted coefficient of determination (adjusted R2) of 0.796, and standard error (Se) of 0.41. These parameters show a strong linear correlation between the variables, indicating that 79.60% of the variability of the execution of a public project is jointly caused by variations in the gross floor area, the estimated cost, the operational technical capacity of the client organization; the operational capacity of the company; the type of service, and the season.
Acesso aberto (Open Access)
The carreau-yasuda fluids: a skin friction equation for turbulent flow in pipes and kolmogorov dissipative scales
(2007-06) ANDRADE, Luiz Claudio Fialho; PETRONÍLIO, Jamilson A.; MANESCHY, Carlos Edilson de Almeida; CRUZ, Daniel Onofre de Almeida; Associação Brasileira de Ciências Mecânicas
In this work the turbulent flow of the Non-Newtonian Carreau-Yasuda fluid will be studied. A skin friction equation for the turbulent flow of Carreau-Yasuda fluids will be derived assuming a logarithmic behavior of the turbulent mean velocity for the near wall flow out of the viscous sub layer. An alternative near wall characteristic length scale which takes into account the effects of the relaxation time will be introduced. The characteristic length will be obtained through the analysis of viscous region near the wall. The results compared with experimental data obtained with Tylose (methyl hydroxil cellulose) solutions showing good agreement. The relations between scales integral and dissipative obtained for length, time, velocity, kinetic energy, and vorticity will be derived for this type of fluid. When the power law index approach to unity the relations reduces to Newtonian case.