Transient testing of perforated plate matrix heat exchangers

A Review on Highly Compact Perforated Plate Heat Exchanger for Cryogenic Applications

“…Because longitudinal thermal conductivity can be separately controlled by the choice of spacer material, perforated plate heat exchangers may also offer significant advantages in low flow rate, low pressure drop applications. [14] had noted that conventional cryogenic heat exchangers such as coiled tube heat exchangers of Hampson and Collins types and brazed aluminum plate fin exchangers are not suitable for small systems used in satellites. Because of the large longitudinal (axial) heat conduction through the walls and the heat leak from ambient, which limit the maximum achievable effectiveness to about 92%.…”

A review on transient test techniques for obtaining heat transfer design data of compact heat exchanger surfaces

“…Such a condition is not possible in real life situation. A theoretical analysis was done by Krishnakumar and Venkatarathnam [20] for the minimum number of plates to be used to get an NTU = 2. Luo et al [19] proposed a conduction-dispersion model for the single-blow transient testing technique, in which the effects of the longitudinal heat conduction in the wall material and the longitudinal thermal dispersion in the fluid were considered.…”

“…Krishnakumar and Venkatarathnam [20][21][22] have proposed a method of using the maximum slope of the temperature history of the fluid at the exit of the compact heat exchanger and the time at which it occurs for the prediction of NTU and the axial conduction parameter of the heat exchanger simultaneously. They have established a relationship for NTU and axial conduction parameter for various combinations of maximum slope and time at maximum slope.…”

The thermal modeling of a matrix heat exchanger using a porous medium and the thermal non-equilibrium model

“…Fig. 12 also represents data of matrix heat exchanger research presented by Venkatarathnam and Sarangi [7] and Krishnakumar and Venkatarathnam [20] in which different researchers work is present: matrix heat exchangers with shifted holes and shifted slots from Subbotin's work, Venkatarathnam [ The difference in the data for the Nusselt number correlations above can be attributed to the different test parameters each of the authors presented. For example, Dorignac's et al [22] data was based on a perforated plate with large diameter perforations: on the order of 10 mm.…”