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Spokane, WA, United States

Gonzaga University is a private Roman Catholic university located in Spokane, Washington, United States. Founded in 1887 by the Society of Jesus, it is one of 28 member institutions of the Association of Jesuit Colleges and Universities. It is named for the young Jesuit saint Aloysius Gonzaga. The campus houses 105 buildings on 131 acres of grassland along the Spokane River, in a residential setting one-half-mile from downtown Spokane.The university was founded by Father Joseph Cataldo, SJ, an Italian-born priest and missionary. He established the Catholic school for local Native Americans whom he served.The university offers bachelor's degrees, master's degrees, and doctoral degrees through its seven colleges, the College of Arts and science, School of Business Administration, School of Education, School of Engineering & Applied Science, School of Law, School of Nursing and Human Physiology, and the School of Professional Studies. Wikipedia.

Szalay P.G.,Eotvos Lorand University | Muller T.,Julich Research Center | Gidofalvi G.,Gonzaga University | Lischka H.,Texas Tech University | And 2 more authors.
Chemical Reviews

Recent developments on gradient theory, calculation of molecular properties, nonadiabatic coupling between electronic states, and relativistic and spin-orbit effects, are discussed. Shepard et al. proposed the subspace projected approximate matrix (SPAM) method that employs a sequence of one or more approximations to the H matrix. Duch and Diercksen compared the formulas and concluded that the DuchDiercksen and Pople corrections clearly outperform the original Davidson correction and its renormalized variants. Tanaka and co-workers developed multireference coupled pair approximation (MRCPA) method that is size-consistent for noninteracting electron pairs and can be applied to excited states, but analytic gradient calculations are not available. Chan and Head-Gordon used a reverse CuthillMcKee reordering of the orbitals to make the one-electron integral matrix close to band-diagonal. Source

Aziz A.,Gonzaga University | Bouaziz M.N.,Dr. Yahia Fares University Center of Medea
Energy Conversion and Management

Approximate but highly accurate solutions for the temperature distribution, fin efficiency, and optimum fin parameter for a constant area longitudinal fin with temperature dependent internal heat generation and thermal conductivity are derived analytically. The method of least squares recently used by the authors is applied to treat the two nonlinearities, one associated with the temperature dependent internal heat generation and the other due to temperature dependent thermal conductivity. The solution is built from the classical solution for a fin with uniform internal heat generation and constant thermal conductivity. The results are presented graphically and compared with the direct numerical solutions. The analytical solutions retain their accuracy (within 1% of the numerical solution) even when there is a 60% increase in thermal conductivity and internal heat generation at the base temperature from their corresponding values at the sink temperature. The present solution is simple (involves hyperbolic functions only) compared with the fairly complex approximate solutions based on the homotopy perturbation method, variational iteration method, and the double series regular perturbation method and offers high accuracy. The simple analytical expressions for the temperature distribution, the fin efficiency and the optimum fin parameter are convenient for use by engineers dealing with the design and analysis of heat generating fins operating with a large temperature difference between the base and the environment. © 2011 Elsevier Ltd. All rights reserved. Source

Pool boiling heat transfer has been extensively studied over decades, but the effect of boundary heating conditions on boiling received little attention. In this work, heat transfer coefficients during pool boiling of five different refrigerants (R123, R245fa, R236fa, R134a, and R22) on the outside surface of a smooth copper tube were measured at the saturation temperature of 6.7 °C; water flows inside the tube and provides heat to the refrigerants to boil (thus, water-heated boiling). Measurements showed that the refrigerant of a higher vapor pressure has a higher heat transfer coefficient, with the exception that R22 performs nearly the same as R134a. A correlation previously developed for electrically-heated pool boiling on cylindrical tubes underpredicts by 30%-46% the heat transfer coefficients during water-heated boiling of the five refrigerants. Among the pool boiling correlations reviewed in this work, the Cooper correlation (for pool boiling on cylindrical tubes) predicts the boiling heat transfer coefficients of R22 and R245fa reasonably well (within ±8.5), but not as well those of the other three refrigerants (underpredicts by nearly 30% for R134a and R236fa and overpredicts by nearly 40% for R123). It is found that the predicted boiling heat transfer coefficients of the five refrigerants by the modified Gorenflo correlation (simply adding a constant multiplier of 1.47 to the Gorenflo correlation) are in excellent agreement with their respective measurements. Source

Makinde O.D.,Cape Peninsula University of Technology | Aziz A.,Gonzaga University
International Journal of Thermal Sciences

A numerical approach has been used to study the heat and mass transfer from a vertical plate embedded in a porous medium experiencing a first-order chemical reaction and exposed to a transverse magnetic field. Instead of the commonly used conditions of constant surface temperature or constant heat flux, a convective boundary condition is employed which makes this study unique and the results more realistic and practically useful. The momentum, energy, and concentration equations derived as coupled second-order, ordinary differential equations are solved numerically using a highly accurate and thoroughly tested finite difference algorithm. The effects of Biot number, thermal Grashof number, mass transfer Grashof number, permeability parameter, Hartmann number, Eckert number, Sherwood number and Schmidt number on the velocity, temperature, and concentration profiles are illustrated graphically. A table containing the numerical data for the plate surface temperature, the wall shear stress, and the local Nusselt and Sherwood numbers is also provided. The discussion focuses on the physical interpretation of the results as well their comparison with the results of previous studies. © 2010 Elsevier Masson SAS. All rights reserved. Source

Aziz A.,Gonzaga University | Khan W.A.,National University of Sciences and Technology
International Journal of Thermal Sciences

Natural convective flow of a nanofluid over a convectively heated vertical plate is investigated using a similarity analysis of the transport equations followed by their numerical computations. The transport model employed includes the effect of Brownian motion and thermophoresis. The analysis shows that velocity, temperature and solid volume fraction of the nanofluid profiles in the respective boundary layers depend, besides the Prandtl and Lewis numbers, on four additional dimensionless parameters, namely a Brownian motion parameter Nb, a thermophoresis parameter Nt, a buoyancy-ratio parameter Nr and convective parameter Nc. In addition to the study of these parameters on the boundary layer flow characteristics (velocity, temperature, solid volume fraction of the nanofluid, skin friction, and heat transfer), correlations for the Nusselt and Sherwood numbers have been developed based on a regression analysis of the data. These linear regression models provide a highly accurate (with a maximum standard error of 0.004) representation of the numerical data and can be conveniently used in engineering practice. © 2011 Elsevier Masson SAS. All rights reserved. Source

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