A comprehensive review on double pipe heat exchangers

Single phase heat transfer and pressure drop analysis of a dimpled enhanced tube

A new heat transfer correlation for transition and turbulent fluid flow in tubes

Experimental study on effect of heat transfer enhancement for single-phase forced convective flow with twisted tape inserts

Determining velocity and friction factor for turbulent flow in smooth tubes

Single phase flow heat transfer and pressure drop measurements in doubly enhanced tubes

Bird strike, also known as avian ingestion, is the collision between a bird and an aircraft. Bird strikes have always been a cause of worry in the aeronautical industry: Aircraft both old and new have suffered from bird strikes. Jet engine ingestion occurs when the bird hits the jet engine of an aircraft and gets sucked in. Given that the fan blades rotate at a high rpm, bird strike on a fan blade causes its displacement into the adjacent blade. This leads to a cascading failure, wherein the entire system fails, thereby resulting in a lot of damage. In this article, we intend to investigate the construction of the fan blade and eventually strengthen its' resistance to bird strikes.

Bird strike analysis of jet engine fan blade

Techniques for 3-D printing parts using spray forming are disclosed. A 3-D printer receives instructions for printing a structure, where the instructions based on a data model of the structure. The 3-D printer receives a suitable material such as a metal, plastic, or composite, and prints the structure based on the instructions using spray forming. In one embodiment, the 3-D printer employs spray forming to finish an angled surface of a 3-D printed part having a stair-stepped effect.

3-d printing using spray forming

Some embodiments of the present disclosure relate to additively manufactured vehicle exterior structures, designed to enclose the vehicle surface and support required operational loads. The vehicle structure includes cavities into which components that require an external interface are inserted. A plurality of components are assembled and integrated into the vehicle structure. The structure may be 3-D printed using multiple printing techniques applied in parallel or in series. In an embodiment, the components and structure are modular, use multiple materials and manufacturing techniques, and enable reparability and replacement of single parts.

Methods and apparatus for additively manufactured endoskeleton-based transport structures

Techniques for 3-D printing a tooling shell for use in producing panels for a transport structure, such as an automobile, boat, aircraft, or other vehicle, or other mechanical structure, are disclosed. A 3-D printer may be used to produce a tooling shell containing Invar and/or some other material for use in molding the panels. A channel may be formed in a 3-D printed tooling shell for enabling resin infusion, vacuum generation or heat transfer. Alternatively, or in addition to, one or more hollow sections may be formed within the 3-D printed tooling shell for reducing a weight of the shell.

Narender Shankar Lakshman

Papers

Single phase flow heat transfer and pressure drop measurements in doubly enhanced tubes

Bird strike analysis of jet engine fan blade

3-d printing using spray forming

Methods and apparatus for additively manufactured endoskeleton-based transport structures

3d-printed tooling and methods for producing same