An analysis has been performed to study the problem of the Thermal performance of a continuously moving convective-radiative rod with variable Thermal conductivity. Highly accurate semi-analytical methods called the least Square method (LSM) and the Galerkin method (GM) are introduced and then used to obtain a nonlinear temperature distribution equation in a fin that allows for more accurate measurements that could make the investigation stand out. This research investigated the influence of various parameters on heat transfer in a continuously moving convective-radiative rod. The parameters examined include the convective-conductive factor (Ncc), dimensionless Thermal conductivity coefficients (a), radiative-conductive parameter (Nrc), Peclet number (Pe), dimensionless convective (θc), and radiative sink temperatures (θr). An increase in the dimensionless Thermal conductivity coefficient (a) led to higher dimensionless temperatures within the rod, indicating an amplification of conductive heat transfer. The convective-conductive parameter (Ncc) demonstrated a direct relationship with heat loss. In contrast, the radiative-conductive parameter (Nrc) exhibited an inverse relationship between radiative heat transfer and local temperature within the fin. A rise in the Peclet number was associated with higher dimensionless temperatures, indicating a faster-moving rod. Additionally, variations in dimensionless convective and radiative sink temperatures affected temperature profiles, with higher sink temperatures resulting in increased dimensionless temperatures. Notably, the dimensionless radiative sink temperature was found to have a more significant impact on overall dimensionless temperature than the convective sink temperature. These findings underscore the intricate interplay of factors governing heat transfer and temperature distribution in the moving rod system. The importance of this work lies in its comprehensive analysis of the intricate interplay of parameters affecting heat transfer and temperature distribution in continuously moving convective-radiative rods, providing valuable insights for optimizing industrial processes and engineering applications.

Correlation of heat transfer coefficients for air flow through the regenerator constructed from randomly packed spheres is reported for the symmetric-balanced mode of operation. The experimental results have been correlated by the least square regression and the following correlation has been obtained: epsilon J(h) = 0.1783 Re-m(-0.2906) The present correlation has been compared with the heat transfer coefficient correlations in the literature.

The main purpose of this article is to provide a critical analysis of published research on these heat transfer surfaces. Important experimental methods and numerical procedures are explained, and many types of vortex generators are described. The phenomenon of flow attributed to vortex generators mounted, connected, pierced, or placed inside surfaces that transmit heat was also examined. In addition, recommendations for applying vortex generator (VGs) technology to improve air-side heat transfer are provided, as well as information on the Thermal performance of newly proposed VG heat transfer surfaces. The performance of air-side heating surfaces can often be significantly improved through the use of vortex generators. However, their effectiveness can be greatly affected by many factors, including fluid flow rate, pipe geometry (diameter, shape, pitch, in-line or staggered configuration), fin type, and geometry of the vortex generator (height, length, shape, angle of attack, etc.). Circular fin-tube heat exchangers generally perform worse in terms of Thermal-hydraulic efficiency than flat-tube-fin and oval-tube-fin heat-exchanging devices, and more recently, suggested vortex generators. Most current heat exchanger optimization methods focus only on Thermal-hydraulic performance.

Switched reluctance motors (SRM) are attracting much attention because of their special advantages. Generated heat by losses can reduce the life time of SRM. Therefore, optimal design based on Thermal modeling helps to improve their performance and increases their life time. In this paper, a lumped Thermal model of SRM based on the analogue of conductive and convective Thermal resistances is proposed. On the other hand, using fans or blowers on motors cause some technical and economical problems. Therefore, an innovative design is proposed in which the rotor itself operates as an axial fan and reduces the temperature rises within the motor. Finally the stator dimensions are optimized using obtained Thermal model.

This paper presents the results of mold filling and cures analyses of a Resin transfer Molding (RTM) process. Three dimensional mold filling and cure analyses have been performed to model resin transfer molding of a hollow composite cylinder. Fiberglass and carbon fiber mats with EPON826 epoxy resin composites are considered. Numerical models are developed in commercial finite element software to simulate resin flow into a mold of cylindrical shape. The cylindrical part has inner and outer diameters of 9 and 10 centimeters, respectively while its length is 100 centimeters. Resin flow through fiber mats is modeled as flow through porous media with Darcy's law. The effects of reinforcement type on mold filling times are investigated. In modeling the composite cure cycle, three-dimensional energy and species equations are solved in the mold domain using a finite difference method. Thermal and cure histories of the composite part are determined in the cure cycle. Based on the results of this investigation the injection cycle of the process is the most time consuming part in the manufacturing of these composite parts. This information can help in the design of the mold, selection of injection pressure, and the cure cycle parameters prior to part manufacture.

Hollow blocks are widely used in construction to reduce the Thermal resistance of building walls. The air within the blocks has a low Thermal conductivity, which makes it possible to consider such hollow blocks as a good insulating material. This work presents a numerical investigation of the impact of Thermal radiation on energy transport and airflow inside a hollow block. The coupled heat transport by free convection, Thermal radiation and conduction through the solid walls is taken into account. The finite-difference procedure is applied to work out numerically the control equations of conservation of momentum, energy and mass in both solid walls and air filled enclosure. The main parameters governing the problem are surface emissivity, Rayleigh number and Thermal conductivity of solid walls. The influence of these factors on the overall heat transfer through hollow block is presented and investigated. The outcomes show that the low emissivity of the inner walls inside the hollow blocks will significantly help to reduce the energy consumption of buildings.