Tien-Mo Shih

Bio: Tien-Mo Shih is an academic researcher from University of Maryland, College Park. The author has contributed to research in topics: Literature survey & Heat transfer. The author has an hindex of 6, co-authored 9 publications receiving 145 citations. Previous affiliations of Tien-Mo Shih include Xiamen University.

Literature Survey of Numerical Heat Transfer (2000–2009): Part II

Abstract: A comprehensive survey of the literature in the area of numerical heat transfer (NHT) published between 2000 and 2009 has been conducted Due to the immenseness of the literature volume, the survey

Literature Survey of Numerical Heat Transfer (2010-2011)

Abstract: Here a comprehensive survey of the literature in the area of numerical heat transfer (NHT) published in 2010 and 2011 has been conducted. Due to the immenseness of the literature volume, journals s...

Hypergolic combustion model for four-stroke heat-barrier piston engines

Abstract: A numerical model for hyperbolic combustion within a four-stroke heat-barrier piston engine has been developed. An idealized fuel injector simulates the type of injector used in current experimental hypergolic combustion research. Significant to the modeling of this injector is the need to overcome the problems posed by a unit Mach number boundary condition at the injector orifice opening. Overall, the model is used to simulate a compression stroke and fuel injection portion of a power stroke. An implicit finite-difference solution of the governing flow field equations is used. The engine is modeled with the fuel injector being colocated with a single valve, making possible an axisymmetric solution. Because of its physics, hypergolic combustion dictates an eddy dissipation combustion approach. In the final run a 20 × 26 mesh is used for the greater region, which is made up of the flow field and a thin portion of the adjacent cylinder linings and piston.

A literature survey on numerical heat transfer (1984-1985)

Abstract: This survey is a review of technical papers in the area of numerical heat transfer (NHT) published in 1986 and 1987. On the basis of technical content and for convenience of presentation, the survey is categorized in the following areas: (A) conduction (or diffusion), (B) boundary-layer flows, (C) recirculating convection or Navier-Stokes flows of elliptic type, (D) turbulent flows, (E) convection around or within cylinders, spheres, or annuli, (F) convection-diffusion instability, (G) radiation or heat transfer combined with radiation, (H) combustion, (J) plumes and jets, (K) heat and mass transfer in porous media, (L) internal channel flows, (M) applications, (N) comparisons, properties, or viabilities of numerical schemes, (P) body-fitted coordinates, (Q) boiling, condensation, and two-phase flows, and (R) convection in water near 4/sup 0/C. Papers that cover more than one topic are categorized under the topic emphasized and are simply cross-referenced under others.

Time-Dependent Photovoltaic-Thermoelectric Hybrid Systems

Abstract: Photovoltaic-thermoelectric hybrid systems that operate in steady state have attracted considerable attention due to the possibility of supplying more power output than the photovoltaic cell alone. In real life, however, the solar energy continually changes during a day, thus rendering the assumption of steady state unrealistic. In this study, we have investigated such time-dependent systems by following the trajectory of the sun between sunrise and sunset. Computed results of thermal efficiencies are parametrized in heat transfer coefficients, the thermal conductivities of the thermoelectric module, and Seebeck coefficients. For values of the Seebeck coefficient greater than 2.13 × 10−3 V/K thermal efficiencies of the hybrid system appear higher than those of the photovoltaic cells alone. To tackle the strong nonlinear coupling between nodal temperatures, and power outputs, we have adopted two-stage iterative schemes.

Studies of mixed convection in vertical tubes

Abstract: The early study of convective heat transfer considered the branches of forced and free convection independently with only passing reference to their possible interaction. In fact the two are extreme cases of the general condition of “mixed” or “combined” forced and free convection where both mechanisms operate simultaneously. The present contribution aims to provide an up-to-date review of those works concerned with mixed convection heat transfer in vertical tubes. The review is divided into two sections, the first dealing with laminar flow, and the second with turbulent flow; further subdivisions are made according to whether the work is theoretical or experimental. Comparisons between theory and experiment are made where possible, expressions defining the conditions for onset of buoyancy effects are presented and equations for determining heat transfer are given. The paper ends with some general comments and recommendations. The survey is restricted to fluids of moderate Prandtl number; mixed convection in liquid metals can display very different characteristics which will be discussed in a future paper.

Experimental investigation on using a novel phase change material (PCM) in micro structure photovoltaic cooling system

Abstract: This work focused on experimental investigation of using a novel phase change material (PCM) in a PV module to enhance its cooling performance. Phase change material by absorbing a lot of heat from the surface of the PV module and control the heat capacitance of the system causes to raising its overall efficiency. In order to postpone the melting of the PCM material, copper microchannel tubes in which cold water is flowing is used and located in a chamber at the backside of the PV module. At first step of experiments, sheep fat has been used as a novel PCM and secondly; in order to increase the cooling efficiency of the sheep fat, CuO nanoparticles (0.004 (w/v)) have added to it. The results of the pure sheep fat and sheep fat+CuO nanoparticels have been compared with the layout of using paraffin wax as a conventional PCM. The obtained results of surface temperature, maximum power increase and electrical efficiency of the PV module for using each PCM materials have been compared. Results show that using both PCMs (sheep fat and paraffin wax) can enhance the cooling performance of the studied PV module; however, sheep fat is more efficient rather than the paraffin wax. In addition, results depicted that adding CuO nanoparticels in the sheep fat causes to significantly decrease in the average temperature of PV module surface. The research experiments of using sheep fat+CuO nanoparticels confirm that the maximum generated power is increased about 24.6% to 26.2% compared with the layout of no cooling system and 5.3% to 12% compared to paraffin wax.

The effect of combustion on a power optimized endoreversible diesel cycle

Abstract: The power potential of an endoreversible Diesel cycle with combustion is analyzed and optimized. The endoreversible cycle is one in which the heating process by combustion and the heat removing process to the surroundings are the only irreversible processes in the cycle. A mathematical expression is derived and optimized for the power output of the cycle. This paper provides another criterion besides thermal efficiency, mean effective pressure and detonation for use in the evaluation of the performance and the suitability of a diesel engine

Concentration fields in evaporating droplets

Abstract: An analytical solution of the problem of diffusional mass transport inside a spherical binary mixture droplet is presented. The droplet evaporates according to the d2-law. Mass fraction profiles of the mixture components are obtained as series expansions in confluent hypergeometric, Legendre and sine/cosine functions. The analytical description is valid for arbitrary ratio of the rate of shrinkage of the sphere surface to the diffusion coefficient in the liquid phase. The results allow for a prediction of the morphology of the dried particles, i.e., whether hollow or solid spheres result from the drying process. The field of application of the results presented is spray drying of solutions of solid substances.