Table 1.

List of variables and constants used in the model

	Unit	Description	Details
Geometric parameters
$L_{\mathrm{a}\mathrm{n}\mathrm{t}}$	1 cm	Antenna length	Measurements
$d_{\mathrm{s}}$	3 $\mathrm{\mu }$m	Sensillum diameter	Measurements
$L_{\mathrm{s}}$	150 $\mathrm{\mu }$m	Sensillum length	Measurements
$\alpha$	300	Scaling factor
$d_{\mathrm{s}\mathrm{a}\mathrm{r}\mathrm{t}}$	900 $\mathrm{\mu }$m	Diameter of an artificial sensillum	$d_{\mathrm{s}\mathrm{a}\mathrm{r}\mathrm{t}}=\alpha d_{\mathrm{s}}$
$L_{\mathrm{a}\mathrm{n}\mathrm{t}\mathrm{a}\mathrm{r}\mathrm{t}}$	13 cm	Length of the artificial microstructure
$s$	16 $\mathrm{\mu }$m	Half distance between sensilla	Measurements
$\sigma$	10.7	Dimensionless distance between cylinders	$\sigma =2s/d_{\mathrm{s}}$
$\varphi$	9.7	Dimensionless spacing between sensilla	$\varphi =\sigma -1$
$d_0=d_{\mathrm{s}}$		Diameter of the cylinder in the heat transfer model	$d_0=d_{\mathrm{s}}$
$S_{\mathrm{f}\mathrm{r}\mathrm{o}\mathrm{n}\mathrm{t}}$	m2	Frontal area	See SI Appendix
Experimental parameters
$v_{\mathrm{a}\mathrm{i}\mathrm{r}}$	m$\cdot$s−1	Air velocity
$v_{\mathrm{o}\mathrm{i}\mathrm{l}}$	m$\cdot$s−1	Oil velocity
$v_{\infty }$	m$\cdot$s−1	Far-field air velocity in the PIV experiment
$v_{\mathrm{n}}$	m$\cdot$s−1	Mean air velocity close to the microstructure
$c_{\text{cyl}}$	$\text{g}\cdot {\text{m}}^{-3}$	Uniform concentration at the surface of a sensillum
$c_{\infty }$	$\text{g}\cdot {\text{m}}^{-3}$	Far-field pheromone concentration
Dimensionless numbers
$\mathrm{L}\mathrm{e}$		Leakiness	Eq. 12
${\mathrm{R}\mathrm{e}}_{\mathrm{a}\mathrm{i}\mathrm{r}}$		Reynolds number in air	Eq. 11
${\mathrm{R}\mathrm{e}}_{\mathrm{o}\mathrm{i}\mathrm{l}}$		Reynolds number in air	${\mathrm{R}\mathrm{e}}_{\mathrm{o}\mathrm{i}\mathrm{l}}=\frac{\alpha d_{\mathrm{s}}*v_{\mathrm{o}\mathrm{i}\mathrm{l}}}{{\nu }_{\mathrm{o}\mathrm{i}\mathrm{l}}}$
$\mathrm{N}\mathrm{u}$		Nusselt number	See SI Appendix
$\mathrm{S}\mathrm{h}$		Sherwood number	See SI Appendix
$\mathrm{G}\mathrm{z}$		Graetz number	See SI Appendix
Physical parameters
${\nu }_{\mathrm{a}\mathrm{i}\mathrm{r}}$	$15.6\times 10^{-6}\hspace{0.17em}{\mathrm{m}}^2\cdot {\mathrm{s}}^{-1}$	Kinematic viscosity of air at 20 °C
${\nu }_{\mathrm{o}\mathrm{i}\mathrm{l}}$	$50\times 10^{-6}\hspace{0.17em}{\mathrm{m}}^2\cdot {\mathrm{s}}^{-1}$	Kinematic viscosity of rapeseed oil at 29 °C	Measurement
$D$	$4.5\times 10^{-6}\hspace{0.17em}{\mathrm{m}}^2\cdot {\mathrm{s}}^{-1}$	Diffusion coefficient of pheromone	See SI Appendix
$w_{\mathrm{m}\mathrm{o}\mathrm{d}}$	${\mathrm{m}}^3\cdot {\mathrm{s}}^{-1}$	Volume flow rate per cylinder in the model	$w_{\mathrm{m}\mathrm{o}\mathrm{d}}=\left(4*s^2-\pi *{\left(\frac{d_{\mathrm{0}}}{2}\right)}^2\right)*v_{\infty }^{\mathrm{m}\mathrm{o}\mathrm{d}}$
$w_{\mathrm{P}\mathrm{I}\mathrm{V}}$	${\mathrm{m}}^3\cdot {\mathrm{s}}^{-1}$	Volume flow rate per cylinder in the experiment	$w_{\mathrm{P}\mathrm{I}\mathrm{V}}=\left(4*s^2-\pi *{\left(\frac{d_{\mathrm{0}}}{2}\right)}^2\right)*v_{\infty }$
Variables
$v_{\mathrm{n}}$	$\mathrm{m}\cdot {\mathrm{s}}^{-1}$	Mean fluid velocity at the entrance to the microstructure
$w_{\mathrm{t}\mathrm{h}\mathrm{r}\mathrm{o}\mathrm{u}\mathrm{g}\mathrm{h}}$	${\mathrm{m}}^3\cdot {\mathrm{s}}^{-1}$	Flux between the two outermost sensilla
$w_{\mathrm{r}\mathrm{e}\mathrm{f}}$	${\mathrm{m}}^3\cdot {\mathrm{s}}^{-1}$	Flux for an equivalent area, taken as $F_{\mathrm{t}\mathrm{h}\mathrm{r}\mathrm{o}\mathrm{u}\mathrm{g}\mathrm{h}}$ for a fluid at velocity $v_{\infty }$
$F_{\mathrm{i}\mathrm{n}}$	$\mathrm{g}\cdot {\mathrm{s}}^{-1}$	Mass flux into the control volume described in Fig. 4
$F_{\mathrm{o}\mathrm{u}\mathrm{t}}$	$\mathrm{g}\cdot {\mathrm{s}}^{-1}$	Mass flux out of the control volume described in Fig. 4
$F_{\mathrm{c}\mathrm{y}\mathrm{l}}$	$\mathrm{g}\cdot {\mathrm{m}}^{-1}\cdot {\mathrm{s}}^{-1}$	Local mass flux to a sensillum surface in Fig. 4
$c$	$\mathrm{g}\cdot {\mathrm{m}}^{-3}$	Pheromone concentration in the fluid
$c_{\mathrm{f}}$	$\mathrm{g}\cdot {\mathrm{m}}^{-3}$	Mean pheromone concentration in the fluid between the sensilla depending on z
${\eta }_{\mathrm{s}}$		Capture efficiency of the model
${\eta }_{\mathrm{m}}$		Capture efficiency of the microstructure