Heat transfer characteristics of impinging jets: The influence of unsteadiness with different waveforms

Evaluation of anisotropic tangential conduction in printed-circuit-board heated-thin-foil heat flux sensors

“…In fact, it is very frequent to encounter studies in which tangential conduction through the board is neglected or in which the conductance anisotropy is claimed to be negligible (see, eg. [14,[23][24][25]).…”

RANS Simulation of the Effect of Pulse Form on Fluid Flow and Convective Heat Transfer in an Intermittent Round Jet Impingement

“…(a) (b) The pulse form (rectangular, triangular, sinusoidal, and their combinations) (see Figure 1b) also has a noticeable effect on the heat transfer intensity over the entire length of the surface (see [15][16][17][18][19]). An experimental study of the flow structure and heat transfer in a pulsed impinging jet on a smooth impact surface and in the presence of a ring mounted on the obstacle surface was performed in [15,16].…”

“…The presence of a ring causes a strong suppression of heat transfer in pulsed impinging jet (up to 80%) in comparison with a smooth surface. In experimental works [15][16][17]19], the influence of the pulse forms on heat transfer for low frequencies (f ≤ 40 Hz) was measured. The maximum heat transfer enhancement, up to 30% in comparison to steady-state flow, was achieved using a rectangular pulse form, while other pulses shapes give similar values for the heat transfer increase (up to 15%).…”

“…The authors of [23,25] numerically studied heat transfer in a pulsed impinging jet using the RANS approach and the Reynolds stress transport model. In the region of small distances between the pipe outlet and impinging surface (H/D ≤ 6) in the pulsed jet, heat transfer at the stagnation point increases with increasing pulse frequency, while for H/D > 8, an increase in frequency causes a The pulse form (rectangular, triangular, sinusoidal, and their combinations) (see Figure 1b) also has a noticeable effect on the heat transfer intensity over the entire length of the surface (see [15][16][17][18][19]). An experimental study of the flow structure and heat transfer in a pulsed impinging jet on a smooth impact surface and in the presence of a ring mounted on the obstacle surface was performed in [15,16].…”

Heat Transfer and Flow Structures of Laminar Confined Slot Impingement Jet with Power-Law Non-Newtonian Fluid

“…Shojaeizadeh et al [11] analyzed the bed roughness effects on the variations of turbulent confined wall jets. Geng et al [12] conducted a series of experiments about unsteady impinging jets with different waveforms. Yarmand et al [13] analyzed the entropy generation in the square cross section tube, which had a constant heat flux under turbulent flow and nanofluids condition.…”