Heat transfer—A review of 1977 literature

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.

Performance of Counterflow, Parallel Plate Heat Exchangers under Laminar Flow Conditions

Heat transfer - a review of 1975 literature

Counterflow double-pipe heat exchanger analysis using a mixed lumped-differential formulation

This paper reviews the four basic types of direct-contact condensation schemes, which have been called “drop type,” “jet and sheet type,” “film type,” and “bubble type” and classifies typical equipment that falls under the classifications. Next, it reviews the current state of our ability to analyze the processes and points out the uncertainties related to our knowledge of the basic mechanisms. In doing so, it points out the needed additional research that should be carried out in order to optimize the design of engineering equipment based upon the various condensation processes.

V. M. K. Sastri

Papers

Surface temperature distributions in double-pipe heat exchanger

Condensation on a falling laminar liquid sheet