Heat Pipe Science And Technology

Abstract: Finned tubes heat exchanger is used on an innovative industrial solar dryer which consists of tree main components namely, solar concentrators, thermal room and heat exchanger. In this drying system, the heat transfer fluid coming from solar concentrators field circulates in the fin-and-tube bundles to heat the air moving through this battery to be injected into the thermal room to dry clay bricks. In this paper, we present a modeling and parametric study of the plate flat fin-and-tube bundles considering the most used models in the evaluation of the heat transfer and air flow performances. First, we carry out with a validation of the proposed physical and numerical models based on previous experimental results. In the second part we focus on the variation effects of the different geometric parameters of the tube bundles on the drying temperature and the pressure drop in order to estimate the performance evaluation criterions. Numerical results have shown that big external tube diameter increases the performance evaluation index by 67% when it varies from 20mm to 35mm which promotes the thermo-flow performances of the heat exchanger. However, Small transverse and longitudinal pitches present a higher air velocity at the minimum flow area and a stronger flow disturbance which ensure better air flow and heat transfer characteristics.

TL;DR: The migrations observed are attributed predominantly to wicking of the liquid cultures upward in the axial grooves developed on the surface of the PP by the eruption and peeling of microfibrils from the surface to indicate a tendency to wet the PP.

TL;DR: In this article, the authors used the Box-Benhnken (BBD) design approach for the Two-Phase Closed Thermosyphon (TPCT) with CeO2 nanofluid using 0.1% volume of Nanofluide with surfactant of ethylene glycol.

TL;DR: In this article, a hybrid two-layer evaporator wick was proposed for passive, high-heat-flux dissipation, which decouples the functions of liquid resupply and capillary-fed boiling heat transfer, making the design scalable to heat input areas of ∼1 cm2 for operation at 1 kW/cm2.