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K. Mastanaiah

Bio: K. Mastanaiah is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Micro heat exchanger & Dynamic scraped surface heat exchanger. The author has an hindex of 1, co-authored 1 publications receiving 6 citations.

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Journal ArticleDOI
TL;DR: In this paper, multilayered heat exchangers were analyzed theoretically and their heat transfer characteristics were clarified, and the problem was treated as a two-dimensional, conjugated one with three phases-two fully developed laminar flows and the exchanger wall.
Abstract: Multilayered heat exchangers were analyzed theoretically and their heat transfer characteristics were clarified. The problem was treated as a two-dimensional, conjugated one with three phases-two fully developed laminar flows and the exchanger wall. From numerical results, the exchanger effectiveness was found to be definitely influenced by the following parameters: Graetz number, heat capacity flow rate ratio, dimensionless wall thickness, and conductance ratios between fluid and wall and between both fluids. Examination of mixed-mean temperature distributions in the exchanger showed that longitudinal wall conduction significantly reduces exchanger effectiveness in the low-Graetz-number region. Experimental results were in fairly good agreement with theoretical predictions.

22 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present results from the 1975 International Solar Energy Congress and Exposition (ILSCE) in Los Angeles, California, USA and present a survey of the literature in various fields of heat transfer during 1975.

20 citations

Journal ArticleDOI
TL;DR: In this article, an analysis of double-pipe heat exchangers under a thermally developing countercurrent flow condition is made, by radially lumping the temperature field in the outer channel, which results in a more involved boundary condition for the inner differential system involving the axially varying outer channel bulk temperature.

11 citations

Journal ArticleDOI
TL;DR: In this article, a mixed lumped-differential formulation for double-pipe heat exchangers is presented that radially lumps the temperature distribution in the outer channel, providing a differential problem for the inner channel that involves a more general type of boundary condition for the wall temperature.
Abstract: A mixed lumped-differential formulation for double-pipe heat exchangers is presented that radially lumps the temperature distribution in the outer channel, providing a differential problem for the inner channel that involves a more general type of boundary condition for the wall temperature. The generalized integral transform technique is extended to allow for the analytical solution of this class of problems. Applicability limits for the simplified model are then established in terms of related parameters, based on numerical results obtained for bulk temperatures and Nusselt numbers, as compared to more involved approaches for the complete differential model. Une formulation mixte differentielle-globale est presentee pour les echangeurs de chaleur a double conduite; cette formulation basee sur une valeur moyenne de la distribution radiale de temperature dans le canal exterieur permet d'etablir une equation differentielle pour le canal interieur qui necessite un type de conditions limites plus general pour la temperature aux parois. La technique des transformees integrales generalisees est etendue de facon a permettre la resolution analytique de cette categorie de problemes. Les limites d'applicabilite pour le modele simplifie sont ensuite etablies en termes de parametres connexes, a partir des resultats obtenus pour les temperatures et les nombres de Nusselt en masse, par comparaison a des techniques plus complexes pour le modele differentiel complet.

6 citations

01 Jan 1998
TL;DR: In this paper, a Rekuperator mit der gesamten Ubertragungsflache is benotigt man den auf die Flache A bezogenen mittleren Warmedurchgangskoeffizienten k and the mittlere Temperaturdifferenz.
Abstract: Zur Berechnung des Warmestroms, der in einem Rekuperator mit der gesamten Ubertragungsflache A ubertragen wird, benotigt man den auf die Flache A bezogenen mittleren Warmedurchgangskoeffizienten k und die mittlere Temperaturdifferenz. Mittlerer Warmedurchgang und mittlere Temperaturdifferenz sind im allgemeinen nicht unabhangig voneinander. Beide Grosen konnen deshalb in der Praxis nur naherungsweise berechnet werden. In der vorliegenden Arbeit soll die Gute dieser Naherungen im Hinblick auf verschiedene Einflusgrosen untersucht und es sollen, soweit notwendig, verbesserte Methoden zur genauen Berechnung entwickelt werden.

5 citations