Hybrid entropy – TOPSIS approach for energy performance prioritization in a rectangular channel employing impinging air jets

Well-designed and well-operated postharvest mechanical handling processes are vital if fresh fruits are to enter markets with minimal damage. The susceptibility of fruit to quality loss during handling is largely determined by mechanical contact and damage. This article reviews current understanding concerning the effect of impact and other mechanical contacts on fruits. It also discusses the major mechanical models that represent the interaction between fruits or a fruit and a surface. In total, 25 mechanical models associated with compression and impact behaviors of fresh fruits, mainly characterizing such behavior between 2 deformable spherical bodies and between a deformable spherical body and a rigid plate are reviewed. Finally, possible future research directions are discussed. The main challenge in fruit handling is to recognize and prevent microscopic damage to fruits, especially internal tissue/cell damage and microcracks resulting from multiple/repetitive impacts and compressions.

https://onlinelibrary.wiley.com/doi/pdf/10.1111/1541-4337.12296

Mechanical Models of Compression and Impact on Fresh Fruits.

\n Jet impingement cooling is considered as one of the most effective heat transfer enhancement techniques. The primary mode of heat transfer enhancement is due to the flow stagnation. The effectiveness of jet impingement as a cooling technique is well documented; however, the application of jet impingement to different problems has been hindered by inability of manufacturing methods to incorporate impingement systems easily into cooling designs. Impingement heat transfer effectiveness can be further improved by improving the jet strength by modifying the jet holes, enhancing surface features, or adding swirl. With an increased usage of this cooling technique and additional modifications in geometry to further enhance the heat transfer capacity to suit different applications, this paper provides a much-needed review of the advancements in the effectiveness of this cooling technique. A comprehensive look at impingement cooling over a variety of modifications and applications with a focus on improved manufacturing techniques impacting novel design and implementation is provided for a variety of heat transfer enhancement applications.

A Modern Review on Jet Impingement Heat Transfer Methods

Jet impingement has led to considerable augmentation in heat transfer characteristics of solar thermal collectors. The impinging air jets are characterized by different control factors where it becomes essential to study their dependence on performance defining criteria so as to arrive at the optimized impinging jet geometry which create one or combination of following conditions favorable for heat transfer with minimal friction losses inside the collector: (a) breaking laminar sub layer (b) increasing turbulent intensity (c) increasing heat transfer area, and (d) generating vortex or secondary flows. The present article examines the thermodynamic behavior of solar thermal collector, review the experimental investigations reported in the literature to study the dependence of control factors on heat transfer and friction characteristics and review the multi criteria decision making methods towards optimization of control factor combinations for an optimal design of the impinging jet solar thermal collector. This study provides a platform for scientists working in the same research field to design a better heat transfer enhancement contrivance in the form of jet control factors to improve the thermohydraulic performance by maximizing the energy output from the system.

K.K. Sundaram

Papers

Experimental average Nusselt number characteristics with inclined non-confined jet impingement of air for cooling application

Ergonomic Analysis to Study the Intensity of MSDs among Practicing Indian Dentists

Firmness Prediction of the Apple Using Capacitance Measurement

Nondestructive Method for Ripening Prediction of Papaya

Analysis of Gutta Percha a Dental Root Filling Material for Impact